{"id":4787,"date":"2021-12-07T22:02:37","date_gmt":"2021-12-08T06:02:37","guid":{"rendered":"https:\/\/www.xh86.me\/?p=4787"},"modified":"2021-12-07T22:09:43","modified_gmt":"2021-12-08T06:09:43","slug":"facebook-%e6%b5%81%e9%87%8f%e8%b7%af%e7%94%b1%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%ef%bc%9a%e4%bb%8e%e5%85%ac%e7%bd%91%e5%85%a5%e5%8f%a3%e5%88%b0%e5%86%85%e7%bd%91%e4%b8%9a%e5%8a%a1%e7%9a%84%e5%85%a8","status":"publish","type":"post","link":"https:\/\/www.xh86.me\/?p=4787","title":{"rendered":"Facebook \u6d41\u91cf\u8def\u7531\u6700\u4f73\u5b9e\u8df5\uff1a\u4ece\u516c\u7f51\u5165\u53e3\u5230\u5185\u7f51\u4e1a\u52a1\u7684\u5168\u8def\u5f84 XDP\/BPF \u57fa\u7840\u8bbe\u65bd"},"content":{"rendered":"
\n
\n

<\/div><\/p>\n
\n

\u8bd1\u8005\u5e8f<\/span><\/h2>\n

\u672c\u6587\u7ffb\u8bd1\u81ea Facebook \u5728 LPC 2021 \u5927\u4f1a\u4e0a\u7684\u4e00\u7bc7\u5206\u4eab\uff1aFrom XDP to Socket: Routing of packets beyond XDP with BPF<\/span>[1]<\/sup>\u3002<\/p>\n

\u6807\u9898\u53ef\u76f4\u8bd1\u4e3a\u300a\u4ece XDP \u5230 Socket \u7684\uff08\u5168\u8def\u5f84\uff09\u6d41\u91cf\u8def\u7531\uff1aXDP \u4e0d\u591f\uff0cBPF \u6765\u51d1\u300b\uff0c\u56e0\u4e3a XDP \u8fd0\u884c \u5728\u7f51\u5361\u4e0a\uff0c\u800c\u4e14\u5728\u8fb9\u754c\u548c\u6d41\u91cf\u5165\u53e3\uff0c\u518d\u5f80\u540e\u7684\u8def\u5f84\uff08\u5c24\u5176\u662f\u5230\u4e86\u5185\u6838\u534f\u8bae\u6808\uff09\u5b83\u5c31\u7ba1\u4e0d \u5230\u4e86\uff0c\u6240\u4ee5\u5f15\u5165\u4e86\u5176\u4ed6\u4e00\u4e9b BPF \u6280\u672f\u6765\u201c\u63a5\u529b\u201d\u8fd9\u4e2a\u8def\u7531\u8fc7\u7a0b\u3002\u53e6\u5916\uff0c \u8fd9\u91cc\u7684\u201c\u8def\u7531\u201d\u5e76\u975e\u72ed\u4e49\u7684\u8def\u7531\u5668\u4e09\u5c42\u8def\u7531\uff0c\u800c\u662f\u6cdb\u6307 L3-L7 \u6d41\u91cf\u8f6c\u53d1\u3002<\/p>\n

\u7531\u4e8e\u8bd1\u8005\u6c34\u5e73\u6709\u9650\uff0c\u672c\u6587\u4e0d\u514d\u5b58\u5728\u9057\u6f0f\u6216\u9519\u8bef\u4e4b\u5904\u3002\u5982\u6709\u7591\u95ee\uff0c\u8bf7\u67e5\u9605\u539f\u6587\u3002<\/strong><\/p>\n

\u4ee5\u4e0b\u662f\u8bd1\u6587\u3002<\/p>\n

\n

1 \u5f15\u8a00<\/span><\/h2>\n

\u7528\u6237\u8bf7\u6c42\u4ece\u516c\u7f51\u5230\u8fbe Facebook \u7684\u8fb9\u754c L4LB \u8282\u70b9\u4e4b\u540e\uff0c\u5f80\u4e0b\u4f1a\u6d89\u53ca\u5230\u4e24\u4e2a\u9636\u6bb5\uff08\u6bcf\u4e2a\u9636 \u6bb5\u90fd\u5305\u62ec\u4e86 L4\/L7\uff09\u7684\u6d41\u91cf\u8f6c\u53d1\uff1a<\/p>\n

    \n
  1. \n
    \u4ece LB \u8282\u70b9\u8d1f\u8f7d\u5747\u8861\u5230\u7279\u5b9a\u4e3b\u673a<\/section>\n<\/li>\n
  2. \n
    \u4e3b\u673a\u5185\uff1a\u5c06\u6d41\u91cf\u8d1f\u8f7d\u5747\u8861\u5230\u4e0d\u540c socket<\/section>\n<\/li>\n<\/ol>\n

    \u4ee5\u4e0a\u4e24\u4e2a\u9636\u6bb5\u90fd\u6d89\u53ca\u5230\u6d41\u91cf\u7684\u4e00\u81f4\u6027\u8def\u7531\uff08consistent routing of packets\uff09\u95ee\u9898\u3002\u672c\u6587\u4ecb\u7ecd\u8fd9\u4e00\u8fc7\u7a0b\u4e2d\u9762\u4e34\u7684\u6311\u6218\uff0c\u4ee5\u53ca\u6211\u4eec\u5982\u4f55\u57fa\u4e8e\u6700\u65b0\u7684 BPF\/XDP \u7279\u6027\u6765\u5e94\u5bf9\u8fd9\u4e9b\u6311\u6218\u3002<\/p>\n

    1.1 \u524d\u671f\u5de5\u4f5c<\/h3>\n

    \u51e0\u5e74\u524d\u4e5f\u662f\u5728 LPC \u5927\u4f1a\uff0c\u6211\u4eec\u5206\u4eab\u4e86 Facebook \u57fa\u4e8e XDP \u5f00\u53d1\u7684\u51e0\u79cd\u670d\u52a1\uff0c\u4f8b\u5982<\/p>\n

      \n
    1. \n
      \u57fa\u4e8e XDP \u7684\u56db\u5c42\u8d1f\u8f7d\u5747\u8861\u5668\uff08L4LB\uff09katran<\/span>[2]<\/sup>\uff0c \u4ece 2017 \u5e74\u5f00\u59cb\uff0c\u6bcf\u4e2a\u8fdb\u5165 facebook.com \u7684\u5305\u90fd\u662f\u7ecf\u8fc7 XDP \u5904\u7406\u7684\uff1b<\/section>\n<\/li>\n
    2. \n
      \u57fa\u4e8e XDP \u7684\u9632\u706b\u5899\uff08\u6321\u5728 katran \u524d\u9762\uff09\u3002<\/section>\n<\/li>\n<\/ol>\n
      <\/div>
      Facebook \u4e24\u4ee3\u8f6f\u4ef6 L4LB \u5bf9\u6bd4\u3002
      \n\u5de6\uff1a\u7b2c\u4e00\u4ee3\uff0c\u57fa\u4e8e IPVS\uff0cL4LB \u9700\u72ec\u5360\u8282\u70b9\uff1b\u53f3\uff1a\u7b2c\u4e8c\u4ee3\uff0c\u57fa\u4e8e XDP\uff0c\u4e0d\u9700\u72ec\u5360\u8282\u70b9\uff0c\u4e0e\u4e1a\u52a1\u540e\u7aef\u6df7\u5e03\u3002<\/figcaption><\/figure>\n

      1.2 Facebook \u6d41\u91cf\u57fa\u7840\u8bbe\u65bd<\/h3>\n

      \u4ece\u5c42\u6b21\u4e0a\u6765\u8bf4\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff0cFacebook \u7684\u6d41\u91cf\u57fa\u7840\u8bbe\u65bd\u5206\u4e3a\u4e24\u5c42\uff1a<\/p>\n

        \n
      1. \n
        \u8fb9\u754c\u5c42\uff08edge tiers\uff09\uff0c\u4f4d\u4e8e PoP \u70b9<\/section>\n<\/li>\n
      2. \n
        \u6570\u636e\u4e2d\u5fc3\u5c42\uff0c\u6211\u4eec\u79f0\u4e3a Origin DC<\/section>\n<\/li>\n<\/ol>\n
        <\/div><\/figure>\n
          \n
        • \n
          \u6bcf\u5c42\u90fd\u6709\u4e00\u5957\u5168\u529f\u80fd LB\uff08L4+L7\uff09<\/section>\n<\/li>\n
        • \n
          Edge PoP \u548c Origin DC \u4e4b\u95f4\u7684 LB \u901a\u5e38\u662f\u957f\u94fe\u63a5<\/section>\n<\/li>\n<\/ul>\n

          \u4ece\u529f\u80fd\u4e0a\u6765\u8bf4\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

          <\/div><\/figure>\n
            \n
          1. \n
            \u7528\u6237\u8fde\u63a5\uff08user connections\uff09\u5728\u8fb9\u754c\u7ec8\u7ed3\uff0c<\/section>\n<\/li>\n
          2. \n
            Edge PoP LB \u5c06 L7 \u6d41\u91cf\u8def\u7531\u5230\u7ec8\u7aef\u4e3b\u673a\uff0c<\/section>\n<\/li>\n
          3. \n
            Origin DC LB \u518d\u5c06 L7 \u6d41\u91cf\u8def\u7531\u5230\u6700\u7ec8\u7684\u5e94\u7528\uff0c\u4f8b\u5982 HHVM \u670d\u52a1\u3002<\/section>\n<\/li>\n<\/ol>\n

            1.3 \u9762\u4e34\u7684\u6311\u6218<\/h3>\n

            \u603b\u7ed3\u4e00\u4e0b\u524d\u9762\u7684\u5185\u5bb9\uff1a\u516c\u7f51\u6d41\u91cf\u5230\u8fbe\u8fb9\u754c\u8282\u70b9\u540e\uff0c\u63a5\u4e0b\u6765\u4f1a\u6d89\u53ca \u4e24\u4e2a\u9636\u6bb5\u7684\u6d41\u91cf\u8d1f\u8f7d\u5747\u8861\uff08\u6bcf\u4e2a\u9636\u6bb5\u90fd\u662f L4+L7\uff09\uff0c<\/p>\n

              \n
            1. \n
              \u5b8f\u89c2\u5c42\u9762\uff1aLB \u8282\u70b9 -> \u540e\u7aef\u4e3b\u673a<\/section>\n<\/li>\n
            2. \n
              \u5fae\u89c2\u5c42\u9762\uff08\u4e3b\u673a\u5185\uff09\uff1a\u4e3b\u673a\u5185\u6838 -> \u4e3b\u673a\u5185\u7684\u4e0d\u540c socket<\/section>\n<\/li>\n<\/ol>\n

              \u8fd9\u4e24\u4e2a\u9636\u6bb5\u90fd\u6d89\u53ca\u5230\u6d41\u91cf\u7684\u9ad8\u6548\u3001\u4e00\u81f4\u6027\u8def\u7531\uff08consistent routing\uff09\u95ee\u9898\u3002<\/p>\n

              \u672c\u6587\u4ecb\u7ecd\u8fd9\u4e00\u8fc7\u7a0b\u4e2d\u9762\u4e34\u7684\u6311\u6218\uff0c\u4ee5\u53ca\u6211\u4eec\u662f\u5982\u4f55\u57fa\u4e8e\u6700\u65b0\u7684 BPF\/XDP \u7279\u6027 \u6765\u89e3\u51b3\u8fd9\u4e9b\u6311\u6218\u7684\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u6211\u4eec\u7528\u5230\u4e86\u4e24\u79cd\u7c7b\u578b\u7684 BPF \u7a0b\u5e8f\uff1a<\/p>\n

                \n
              1. \n
                BPF TCP header options<\/span>[3]<\/sup>\uff1a\u89e3\u51b3\u4e3b\u673a\u5916\uff08\u5b8f\u89c2\uff09\u8d1f\u8f7d\u5747\u8861\u95ee\u9898\uff1b<\/section>\n<\/li>\n
              2. \n
                BPF_PROG_TYPE_SK_REUSEPORT<\/code><\/span>[4]<\/sup>\uff08\u53ca\u76f8\u5173 map \u7c7b\u578b BPF_MAP_TYPE_REUSEPORT_SOCKARRAY<\/code>\uff09\uff1a\u89e3\u51b3\u4e3b\u673a\u5185\uff08\u5fae\u89c2\uff09\u8d1f\u8f7d\u5747\u8861\u95ee\u9898\u3002<\/section>\n<\/li>\n<\/ol>\n

                2 \u9009\u62e9\u540e\u7aef\u4e3b\u673a\uff1a\u6570\u636e\u4e2d\u5fc3\u5185\u6d41\u91cf\u7684\u4e00\u81f4\u6027\u4e0e\u65e0\u72b6\u6001\u8def\u7531\uff08\u56db\u5c42\u8d1f\u8f7d\u5747\u8861\uff09<\/span><\/h2>\n

                \u5148\u770b\u7b2c\u4e00\u90e8\u5206\uff0c\u4ece LB \u8282\u70b9\u8f6c\u53d1\u5230 backend \u673a\u5668\u65f6\uff0c\u5982\u4f55\u6765\u9009\u62e9\u4e3b\u673a\u3002\u8fd9\u662f\u56db\u5c42\u8d1f\u8f7d\u5747\u8861\u95ee\u9898\u3002<\/p>\n

                2.1 Katran (L4LB) \u8d1f\u8f7d\u5747\u8861\u673a\u5236<\/h3>\n

                \u56de\u5230\u6d41\u91cf\u57fa\u7840\u8bbe\u65bd\u56fe\uff0c\u8fd9\u91cc\u4e3b\u8981\u5173\u6ce8 Origin DC \u5185\u90e8 L4-L7 \u7684\u8d1f\u8f7d\u5747\u8861\uff0c<\/p>\n

                <\/div><\/figure>\n

                katran \u662f\u57fa\u4e8e XDP \u5b9e\u73b0\u7684\u56db\u5c42\u8d1f\u8f7d\u5747\u8861\u5668\uff0c\u5b83\u7684\u5185\u90e8\u673a\u5236\uff1a<\/p>\n

                  \n
                • \n
                  \u5b9e\u73b0\u4e86\u4e00\u4e2a Maglev Hash \u53d8\u79cd\uff0c\u901a\u8fc7\u4e00\u81f4\u6027\u54c8\u5e0c\u9009\u62e9\u540e\u7aef\uff1b<\/section>\n<\/li>\n
                • \n
                  \u5728\u4e00\u81f4\u6027\u54c8\u5e0c\u4e4b\u4e0a\uff0c\u8fd8\u7ef4\u62a4\u4e86\u81ea\u5df1\u7684\u4e00\u4e2a\u672c\u5730\u7f13\u5b58\u6765\u8ddf\u8e2a\u8fde\u63a5\u3002\u8fd9\u4e2a\u8bbe\u8ba1\u662f\u4e3a\u4e86\u5728\u67d0\u4e9b\u540e\u7aef\u7ef4\u62a4\u6216\u6545\u969c\u65f6\uff0c\u907f\u514d\u5176\u4ed6\u540e\u7aef\u7684\u54c8\u5e0c\u53d1\u751f\u53d8\u5316\uff0c\u540e\u9762\u4f1a\u8be6\u7ec6\u8ba8\u8bba\u3002<\/section>\n<\/li>\n<\/ul>\n

                  \u7528\u4f2a\u4ee3\u7801\u6765\u8868\u793a Katran \u9009\u62e9\u540e\u7aef\u4e3b\u673a\u7684\u903b\u8f91\uff1a<\/p>\n

                  int<\/span>\u00a0pick_host<\/span>(packet*\u00a0pkt)<\/span>\u00a0<\/span>{\r\n\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0(is_in_local_cache(pkt))\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0local_cache[pkt]<\/code><\/pre>\n
                  return<\/span>\u00a0consistent_hash(pkt)\u00a0%\u00a0server_ring
                  \n}<\/p>\n
                  <\/code><\/pre>\n
                  \u8fd9\u79cd\u673a\u5236\u975e\u5e38\u6709\u6548\uff0c\u4e5f\u975e\u5e38\u9ad8\u6548\uff08highly effective and efficient\uff09\u3002<\/p>\n
                  2.2 \u4e00\u81f4\u6027\u54c8\u5e0c\u7684\u5c40\u9650\u6027<\/h3>\n
                  2.2.1 \u5bb9\u9519\u6027\uff1a\u540e\u7aef\u6545\u969c\u5bf9\u975e\u76f8\u5173\u8fde\u63a5\u7684\u6270\u52a8<\/h4>\n
                  \u4e00\u81f4\u6027\u54c8\u5e0c\u7684\u4e00\u4e2a\u6838\u5fc3\u7279\u6027\u662f\u5177\u5907\u5bf9\u540e\u7aef\u53d8\u5316\u7684\u5bb9\u9519\u6027\uff08resilience to backend changes\uff09\u3002\u5f53\u4e00\u90e8\u5206\u540e\u7aef\u53d1\u751f\u6545\u969c\u65f6\uff0c\u5176\u4ed6\u540e\u7aef\u7684\u54c8\u5e0c\u8868\u9879\u4e0d\u53d7\u5f71\u54cd\uff08\u56e0\u6b64\u5bf9\u5e94\u7684\u8fde\u63a5\u53ca\u4e3b\u673a\u4e5f\u4e0d\u53d7\u5f71\u54cd\uff09\u3002Maglev \u8bba\u6587\u4e2d\u5df2\u7ecf\u7ed9\u51fa\u4e86\u8bc4\u4f30\u8fd9\u79cd\u5bb9\u9519\u6027\u7684\u6307\u6807\uff0c\u5982\u4e0b\u56fe\uff0c<\/p>\n
                  <\/div>
                  Resilience of Maglev hashing to backend changes<\/figcaption><\/figure>\n
                  \n
                  Maglev: A fast and reliable software network load balancer. OSDI 2016<\/p>\n<\/blockquote>\n
                    \n
                  • \n
                    \u6a2a\u8f74\u8868\u793a backend \u6302\u6389\u7684\u767e\u5206\u6bd4<\/section>\n<\/li>\n
                  • \n
                    \u7eb5\u8f74\u662f\u54c8\u5e0c\u8868\u9879\uff08entries\uff09\u53d8\u5316\u7684\u767e\u5206\u6bd4\uff0c\u5bf9\u5e94\u53d7\u5f71\u54cd\u8fde\u63a5\u7684\u767e\u5206\u6bd4<\/section>\n<\/li>\n<\/ul>\n
                    Google \u653e\u8fd9\u5f20\u56fe\u662f\u60f3\u8bf4\u660e\uff1a\u4e00\u90e8\u5206\u540e\u7aef\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5176\u4ed6\u540e\u7aef\u53d7\u5f71\u54cd\u7684\u6982\u7387\u975e\u5e38\u5c0f\uff1b\u4f46\u4ece\u6211\u4eec\u7684\u89d2\u5ea6\u6765\u8bf4\uff0c\u4ee5\u4e0a\u8fd9\u5f20\u56fe\u8bf4\u660e\uff1a\u5373\u4f7f\u540e\u7aef\u6302\u6389\u7684\u6bd4\u4f8b\u975e\u5e38\u5c0f\uff0c \u6574\u4e2a\u54c8\u5e0c\u8868\u8fd8\u662f\u4f1a\u53d7\u5f71\u54cd\uff0c\u5e76\u4e0d\u662f\u5b8c\u5168\u65e0\u611f\u77e5 \u2014\u2014 \u8fd9\u5c31\u4f1a \u5bfc\u81f4\u4e00\u90e8\u5206\u6d41\u91cf\u88ab\u9519\u8bef\u8def\u7531\uff08misrouting\uff09\uff1a<\/p>\n
                      \n
                    • \n
                      \u5bf9\u4e8e\u77ed\u8fde\u63a5\u6765\u8bf4\uff0c\u4f8b\u5982\u5178\u578b\u7684 HTTP \u5e94\u7528\uff0c\u8fd9\u4e2a\u95ee\u9898\u53ef\u80fd\u5f71\u54cd\u4e0d\u5927\uff1b<\/section>\n<\/li>\n
                    • \n
                      \u4f46\u5bf9\u4e8e tcp \u957f\u8fde\u63a5\uff0c\u4f8b\u5982\u6301\u7eed\u51e0\u4e2a\u5c0f\u65f6\u7684\u89c6\u9891\u6d41\uff0c\u8fd9\u79cd\u6270\u52a8\u5c31\u4e0d\u80fd\u5fcd\u4e86\u3002<\/section>\n<\/li>\n<\/ul>\n
                      2.2.2 TCP \u957f\u8fde\u63a5\u9762\u4e34\u7684\u95ee\u9898<\/h4>\n
                      \u9996\u5148\u8981\u8bf4\u660e\uff0c\u9ad8\u6548 != 100% \u6709\u6548\u3002\u5bf9\u4e8e TCP \u957f\u8fde\u63a5\u6765\u8bf4\uff08\u4f8b\u5982\u89c6\u9891\uff09\uff0c\u6709\u4e24\u79cd\u573a\u666f\u4f1a\u5b83\u4eec\u88ab reset\uff1a<\/p>\n
                      int<\/span>\u00a0pick_host<\/span>(packet*\u00a0pkt)<\/span>\u00a0<\/span>{\r\n\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0(is_in_local_cache(pkt))\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u573a\u666f\u4e00\uff1aECMP shuffle \u65f6\uff08\u4f8b\u5982 LB \u8282\u70b9\u7ef4\u62a4\u6216\u6545\u969c\uff09\uff0c\u8fd9\u91cc\u4f1a miss<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0local_cache[pkt]<\/code><\/pre>\n
                      return<\/span>\u00a0consistent_hash(pkt)\u00a0%\u00a0server_ring\u00a0\/\/\u00a0\u573a\u666f\u4e8c\uff1a\u540e\u7aef\u7ef4\u62a4\u6216\u6545\u969c\u65f6\uff0c\u8fd9\u91cc\u7684\u597d\u50cf\u6709\uff08\u8f83\u5c0f\uff09\u6982\u7387\u53d1\u751f\u53d8\u5316<\/span>
                      \n}<\/p>\n
                      <\/code><\/pre>\n
                      \u89e3\u91ca\u4e00\u4e0b\uff1a<\/p>\n
                        \n
                      1. \n
                        \u5982\u679c LB \u5347\u7ea7\u3001\u7ef4\u62a4\u6216\u53d1\u751f\u6545\u969c\uff0c\u4f1a\u5bfc\u81f4\u8def\u7531\u5668 ECMP shuffle\uff0c\u90a3\u539f\u6765\u8def\u7531\u5230\u67d0\u4e2a LB \u8282\u70b9\u7684 flow\uff0c\u53ef\u80fd\u4f1a\u88ab\u91cd\u65b0\u8def\u7531\u5230\u53e6\u4e00\u53f0 LB \u4e0a\uff1b\u867d\u7136\u6211\u4eec\u7ef4\u62a4\u4e86 cache\uff0c\u4f46\u5b83\u662f LB node local \u7684\uff0c\u56e0\u6b64\u4f1a\u53d1\u751f cache miss\uff1b<\/section>\n<\/li>\n
                      2. \n
                        \u5982\u679c\u540e\u7aef\u8282\u70b9\u5347\u7ea7\u3001\u7ef4\u62a4\u6216\u53d1\u751f\u6545\u969c\uff0c\u90a3\u4e48\u6839\u636e\u524d\u9762 maglev \u5bb9\u9519\u6027\u7684\u5b9e\u9a8c\u7ed3\u679c\uff0c\u4f1a\u6709\u4e00 \u90e8\u5206\uff08\u867d\u7136\u6bd4\u4f8b\u4e0d\u662f\u5f88\u5927\uff09\u7684 flow \u53d7\u5230\u5f71\u54cd\uff0c\u5bfc\u81f4\u8def\u7531\u9519\u8bef\u3002<\/section>\n<\/li>\n<\/ol>\n
                        \u4ee5\u4e0a\u5206\u6790\u53ef\u4ee5\u770b\u51fa\uff0c\u201c\u6301\u7eed\u53d1\u5e03\u201d L4 \u548c L7 \u670d\u52a1\u4f1a\u5bfc\u81f4\u8fde\u63a5\u4e0d\u7a33\u5b9a\uff0c\u964d\u4f4e\u6574\u4f53\u53ef\u9760\u6027\u3002\u9664\u4e86\u53d1\u5e03\u4e4b\u5916\uff0c\u6211\u4eec\u968f\u65f6\u90fd\u6709\u5927\u91cf\u670d\u52a1\u5668\u8981\u7ef4\u62a4\uff0c\u56e0\u6b64\u54c8\u5e0c ring \u53d1\u751f\u53d8\u5316\uff08\u4e00\u81f4\u6027\u54c8\u5e0c \u53d1\u751f\u6270\u52a8\uff09\u662f\u65e5\u5e38\u800c\u975e\u4f8b\u5916\u3002\u4efb\u4f55\u65f6\u5019\u53d1\u751f ECMP shuffle \u548c\u670d\u52a1\u53d1\u5e03\/\u4e3b\u673a\u7ef4\u62a4\uff0c\u90fd\u4f1a\u5bfc \u81f4\u4e00\u90e8\u5206 active \u8fde\u63a5\u53d7\u635f\uff0c\u867d\u7136\u91cf\u5f88\u5c0f\uff0c\u4f46\u4f1a\u964d\u4f4e\u6574\u4f53\u7684\u53ef\u9760\u6027\u6307\u6807\u3002<\/p>\n
                        \u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u4e00\u79cd\u65b9\u5f0f\u662f\u5728\u6240\u6709 LB \u8282\u70b9\u95f4\u5171\u4eab\u8fd9\u4e2a local cache \uff08\u7c7b\u4f3c\u4e8e L4LB \u4e2d\u7684 session replication\uff09\uff0c\u4f46\u8fd9\u662f\u4e2a\u5f88\u7cdf\u7cd5\u7684\u4e3b\u610f \uff0c\u56e0\u4e3a\u8fd9\u5c31\u9700\u8981\u53bb\u89e3\u51b3\u53e6\u5916\u4e00\u5927\u5806\u5206\u5e03\u5f0f\u7cfb\u7edf\u76f8\u5173\u7684\u95ee\u9898\uff0c\u5c24\u5176\u6211\u4eec\u4e0d\u5e0c\u671b\u5f15\u5165\u4efb\u4f55 \u4f1a\u964d\u4f4e\u8fd9\u4e2a\u6781\u5feb\u6570\u636e\u8def\u5f84\u6027\u80fd\u7684\u4e1c\u897f\u3002<\/p>\n
                        2.2.3 QUIC \u534f\u8bae\u4e3a\u4ec0\u4e48\u4e0d\u53d7\u5f71\u54cd<\/h4>\n
                        \u4f46\u5bf9\u4e8e QUIC \u6765\u8bf4\uff0c\u8fd9\u90fd\u4e0d\u662f\u95ee\u9898\u3002<\/p>\n
                        connection_id<\/code><\/h5>\n
                        QUIC \u89c4\u8303\uff08RFC 9000\uff09\u4e2d\u5141\u8bb8 server \u5c06\u4efb\u610f\u4fe1\u606f\u5d4c\u5165\u5230\u5305\u7684 connection_id<\/code> \u5b57\u6bb5\u3002<\/p>\n
                        Facebook \u5df2\u7ecf\u5e7f\u6cdb\u4f7f\u7528 QUIC \u534f\u8bae\uff0c\u56e0\u6b64\u5728 Facebook \u5185\u90e8\uff0c\u6211\u4eec\u53ef\u4ee5<\/p>\n
                          \n
                        1. \n
                          \u5728 server \u7aef\u5c06\u8def\u7531\u4fe1\u606f\uff08routing information\uff09\u5d4c\u5165\u5230 connection_id<\/code> \u5b57\u6bb5\uff0c\u5e76<\/section>\n<\/li>\n
                        2. \n
                          \u8981\u6c42\u5ba2\u6237\u7aef\u5fc5\u987b\u5c06\u8fd9\u4e2a\u4fe1\u606f\u5e26\u56de\u6765\u3002<\/section>\n<\/li>\n<\/ol>\n
                          \u5b8c\u5168\u65e0\u72b6\u6001\u56db\u5c42\u8def\u7531<\/h5>\n
                          \u8fd9\u6837\u6574\u6761\u94fe\u8def\u4e0a\u90fd\u53ef\u4ee5\u4ece\u5305\u4e2d\u63d0\u53d6\u8fd9\u4e2a id\uff0c\u65e0\u9700\u4efb\u4f55\u54c8\u5e0c\u6216 cache \u67e5\u627e\uff0c\u6700\u7ec8\u5b9e\u73b0\u7684\u662f\u4e00\u4e2a \u5b8c\u5168\u65e0\u72b6\u6001\u7684\u56db\u5c42\u8def\u7531\uff08completely stateless routing in L4\uff09\u3002<\/p>\n
                          \u90a3\u80fd\u4e0d\u80fd\u4e3a TCP \u505a\u7c7b\u4f3c\u7684\u4e8b\u60c5\u5462\uff1f\u7b54\u6848\u662f\u53ef\u4ee5\u3002\u8fd9\u5c31\u8981\u7528\u5230 BPF-TCP header option \u4e86\u3002<\/p>\n
                          2.3 TCP \u8fde\u63a5\u89e3\u51b3\u65b9\u6848\uff1a\u5229\u7528 BPF \u5c06 backend server \u4fe1\u606f\u5d4c\u5165 TCP Header<\/h3>\n
                          2.3.1 \u539f\u7406\u548c\u6d41\u7a0b<\/h4>\n
                          \u57fa\u672c\u601d\u60f3\uff1a<\/p>\n
                            \n
                          1. \n
                            \u7f16\u5199\u4e00\u6bb5 BPF_PROG_TYPE_SOCK_OPS<\/code> \u7c7b\u578b\u7684 BPF \u7a0b\u5e8f\uff0cattach \u5230 cgroup\uff1a<\/section>\n
                              \n
                            • \n
                              \u5728 LISTEN, CONNECT, CONN_ESTD \u7b49\u4e8b\u4ef6\u65f6\u4f1a\u89e6\u53d1 BPF \u7a0b\u5e8f\u7684\u6267\u884c<\/section>\n<\/li>\n
                            • \n
                              BPF \u7a0b\u5e8f\u53ef\u4ee5\u83b7\u53d6\u5305\u7684 TCP Header\uff0c\u7136\u540e\u5f80\u5176\u4e2d\u5199\u5165\u8def\u7531\u4fe1\u606f\uff08\u8fd9\u91cc\u662f server_id\uff09\uff0c\u6216\u8005\u4ece\u4e2d\u8bfb\u53d6\u8def\u7531\u4fe1\u606f<\/section>\n<\/li>\n<\/ul>\n<\/li>\n
                            • \n
                              \u5728 L4LB \u4fa7\u7ef4\u62a4\u4e00\u4e2a server_id \u7f13\u5b58\uff0c\u8bb0\u5f55\u4ecd\u7136\u5b58\u6d3b\u7684 backend \u4e3b\u673a<\/section>\n<\/li>\n<\/ol>\n
                              \u4ee5\u4e0b\u56fe\u4e3a\u4f8b\uff0c\u6211\u4eec\u6765\u770b\u4e0b LB \u8282\u70b9\u548c backend \u6545\u969c\u65f6\uff0c\u5176\u4ed6 backend \u4e0a\u7684\u539f\u6709\u8fde\u63a5\u5982\u4f55\u505a\u5230\u4e0d\u53d7\u5f71\u54cd\uff1a<\/p>\n
                              <\/div><\/figure>\n
                                \n
                              • \n
                                  \n
                                1. \n
                                  \u5ba2\u6237\u7aef\u53d1\u8d77\u4e00\u4e2a SYN\uff1b<\/section>\n<\/li>\n<\/ol>\n<\/li>\n
                                2. \n
                                    \n
                                  1. \n
                                    L4LB \u7b2c\u4e00\u6b21\u89c1\u8fd9\u6761 flow\uff0c\u56e0\u6b64\u901a\u8fc7\u4e00\u81f4\u6027\u54c8\u5e0c\u4e3a\u5b83\u9009\u62e9\u4e00\u53f0 backend \u4e3b\u673a\uff0c\u7136\u540e\u5c06\u5305\u8f6c\u53d1\u8fc7\u53bb\uff1b<\/section>\n<\/li>\n<\/ol>\n<\/li>\n
                                  2. \n
                                      \n
                                    • \n
                                      \u56fe\u4e2d\u8fd9\u53f0\u4e3b\u673a\u83b7\u53d6\u5230\u81ea\u5df1\u7684 server_id \u662f 42\uff0c\u7136\u540e\u5c06\u8fd9\u4e2a\u503c\u5199\u5230 TCP header\uff1b<\/section>\n<\/li>\n
                                    • \n
                                      \u5ba2\u6237\u7aef\u4e3b\u673a\u6536\u5230\u5305\u540e\uff0c\u4f1a\u89e3\u6790\u8fd9\u4e2a id \u5e76\u5b58\u4e0b\u6765\uff0c\u540e\u9762\u53d1\u5305\u65f6\u90fd\u4f1a\u5e26\u4e0a\u8fd9\u4e2a server_id\uff1b<\/section>\n<\/li>\n<\/ul>\n<\/li>\n
                                    • \n
                                        \n
                                      1. \n
                                        \u670d\u52a1\u7aef\u5e94\u7b54 SYN+ACK\uff0c\u5176\u4e2d \u670d\u52a1\u7aef BPF \u7a0b\u5e8f\u5c06 server_id \u5d4c\u5165\u5230 TCP \u5934\u4e2d\uff1b<\/section>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n
                                        \u5047\u8bbe\u8fc7\u4e86\u4e00\u4f1a\u53d1\u751f\u6545\u969c\uff0c\u524d\u9762\u90a3\u53f0 L4LB \u6302\u4e86\uff08\u8fd9\u4f1a\u5bfc\u81f4 ECMP \u53d1\u751f\u53d8\u5316\uff09\uff1b\u53e6\u5916\uff0c\u67d0\u4e9b backend hosts \u4e5f\u6302\u4e86\uff08\u8fd9\u4f1a \u5f71\u54cd\u4e00\u81f4\u6027\u54c8\u5e0c\uff0c\u539f\u6709\u8fde\u63a5\u63a5\u4e0b\u6765\u6709\u5c0f\u6982\u7387\u4f1a\u53d7\u5230\u5f71\u54cd\uff09\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\uff0c<\/p>\n
                                          \n
                                        • \n
                                            \n
                                          1. \n
                                            \u5ba2\u6237\u7aef\u6d41\u91cf\u5c06\u88ab\uff08\u6570\u636e\u4e2d\u5fc3\u57fa\u7840\u8bbe\u65bd\uff09\u8f6c\u53d1\u5230\u53e6\u4e00\u53f0 L4LB\uff1b<\/section>\n<\/li>\n<\/ol>\n<\/li>\n
                                          2. \n
                                              \n
                                            1. \n
                                              \u8fd9\u53f0\u65b0\u7684 L4LB \u89e3\u6790\u5ba2\u6237\u7aef\u5305\u7684 TCP header\uff0c\u63d0\u53d6 server_id\uff0c\u67e5\u8be2 server_id \u7f13\u5b58\uff08 \u6ce8\u610f\u4e0d\u662f Katran \u7684 node-local \u8fde\u63a5\u7f13\u5b58\uff09\u4e4b\u540e\u53d1\u73b0 \u8fd9\u53f0\u673a\u5668\u8fd8\u662f active \u7684\uff0c\u56e0\u6b64\u76f4\u63a5\u8f6c\u53d1\u7ed9\u8fd9\u53f0\u673a\u5668\u3002<\/section>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n
                                              \u53ef\u4ee5\u770b\u5230\u5728 TCP Header \u4e2d\u5f15\u5165\u4e86\u8def\u7531\u4fe1\u606f\u540e\uff0c\u672a\u53d1\u751f\u6545\u969c\u7684\u4e3b\u673a\u4e0a\u7684\u957f\u8fde\u63a5\u5c31\u80fd\u591f\u907f\u514d \u56e0 L4LB \u548c\u4e3b\u673a\u6302\u6389\u800c\u5bfc\u81f4\u7684 misrouting\uff08\u4f1a\u88ab\u76f4\u63a5 reset\uff09\u3002<\/p>\n
                                              2.3.2 \u5f00\u9500<\/h4>\n
                                              \u6570\u636e\u5f00\u9500\uff1aTCP header \u589e\u52a0 6 \u4e2a\u5b57\u8282<\/h5>\n
                                              struct\u00a0tcp_opt\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0uint8_t\u00a0\u00a0kind;\r\n\u00a0\u00a0\u00a0\u00a0uint8_t\u00a0\u00a0len;\r\n\u00a0\u00a0\u00a0\u00a0uint32_t\u00a0server_id;\r\n};\u00a0\/\/\u00a06-bytes\u00a0total\r\n<\/code><\/pre>\n
                                              \u8fd0\u884c\u65f6\u5f00\u9500\uff1a\u4e0d\u660e\u663e<\/h5>\n
                                              \u9700\u8981\u5728 L4LB \u4e2d\u89e3\u6790 TCP header \u4e2d\u7684 server_id \u5b57\u6bb5\uff0c\u7406\u8bba\u4e0a\u6765\u8bf4\uff0c\u8fd9\u4e2a\u5f00\u9500\u8ddf\u4ee3\u7801\u5b9e \u73b0\u7684\u597d\u574f\u76f8\u5173\u3002\u6211\u4eec\u6d4b\u91cf\u4e86\u81ea\u5df1\u7684\u5b9e\u73b0\uff0c\u8fd9\u4e2a\u5f00\u9500\u975e\u5e38\u4e0d\u660e\u663e\u3002<\/p>\n
                                              2.3.3 \u5b9e\u73b0\u7ec6\u8282<\/h4>\n
                                              \u76d1\u542c\u7684 socket \u4e8b\u4ef6<\/h5>\n
                                              switch<\/span>\u00a0(skops->op)\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_TCP_LISTEN_CB:\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_TCP_CONNECT_CB:\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_PARSE_HDR_OPT_CB:\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_HDR_OPT_LEN_CB:\r\n\u00a0\u00a0\u00a0\u00a0case<\/span>\u00a0BPF_SOCK_OPS_WRITE_HDR_OPT_CB:\r\n\u00a0\u00a0\u00a0\u00a0.\u00a0.\u00a0.\r\n}\r\n<\/code><\/pre>\n
                                              \u7ef4\u62a4 TCP flow -> server_id \u7684\u6620\u5c04<\/h5>\n
                                              \u5728\u6bcf\u4e2a LB \u8282\u70b9\u4e0a\u7528 bpf_sk_storage \u6765\u5b58\u50a8 per-flow server_id\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c<\/p>\n
                                                \n
                                              1. \n
                                                \u5bf9\u4e8e\u5efa\u8fde\u5305\u7279\u6b8a\u5904\u7406\uff0c<\/section>\n<\/li>\n
                                              2. \n
                                                \u5efa\u8fde\u4e4b\u540e\u4f1a\u7ef4\u62a4\u6709 flow \u4fe1\u606f\uff08\u4f8b\u5982\u8fde\u63a5\u8ddf\u8e2a\uff09\uff0c<\/section>\n<\/li>\n
                                              3. \n
                                                \u5bf9\u4e8e\u5efa\u8fde\u6210\u529f\u540e\u7684\u666e\u901a\u6d41\u91cf\uff0c\u4ece flow \u4fe1\u606f\u5c31\u80fd\u76f4\u63a5\u6620\u5c04\u5230 server_id\uff0c \u4e0d\u9700\u8981\u9488\u5bf9\u6bcf\u4e2a\u5305\u53bb\u89e3\u6790 TCP header\u3002<\/section>\n<\/li>\n<\/ol>\n
                                                server_id \u7684\u5206\u914d\u548c\u540c\u6b65<\/h5>\n
                                                \u524d\u9762\u8fd8\u6ca1\u6709\u63d0\u5230\u5982\u4f55\u5206\u914d server_id\uff0c\u4ee5\u53ca\u5982\u4f55\u4fdd\u8bc1\u8fd9\u4e9b\u540e\u7aef\u4fe1\u606f\u5728\u8d1f \u8f7d\u5747\u8861\u5668\u4fa7\u7684\u65f6\u6548\u6027\u548c\u6709\u6548\u6027\u3002<\/p>\n
                                                \u6211\u4eec\u6709\u4e00\u4e2a offline \u5de5\u4f5c\u6d41\uff0c\u4f1a\u7ed9\u90a3\u4e9b\u6709\u4e1a\u52a1\u5728\u8fd0\u884c\u7684\u4e3b\u673a\u968f\u673a\u5206\u914d \u4e00\u4e2a id\uff0c\u7136\u540e\u5c06\u8fd9\u4e2a\u4fe1\u606f\u540c\u6b65\u7ed9 L4 \u548c L7 \u8d1f\u8f7d\u5747\u8861\u5668\uff08Katran and Proxygen\uff09\uff0c \u540e\u8005\u62ff\u5230\u8fd9\u4e9b\u4fe1\u606f\u540e\u4f1a\u5c06\u5176\u52a0\u8f7d\u5230\u81ea\u5df1\u7684\u63a7\u5236\u5e73\u9762\u3002\u56e0\u6b64\u8fd9\u4e2a\u7cfb\u7edf\u4e0d\u4f1a\u6709\u989d\u5916\u5f00\u9500\uff0c\u53ea\u8981 \u4fdd\u8bc1 LB \u7684\u5143\u4fe1\u606f\u540c\u6b65\u5c31\u884c\u4e86\u3002<\/p>\n
                                                \u7531\u4e8e\u8fd9\u4e2a\u673a\u5236\u540c\u65f6\u9002\u7528\u4e8e QUIC \u548c TCP\uff0c\u56e0\u6b64 pipeline \u662f\u540c\u4e00\u4e2a\u3002<\/p>\n
                                                2.3.4 \u6548\u679c<\/h4>\n
                                                \u4e0b\u9762\u662f\u4e00\u6b21\u53d1\u5e03\uff0c\u53ef\u4ee5\u770b\u5230\u53d1\u5e03\u671f\u95f4 connection reset \u5e76\u6ca1\u6709\u660e\u663e\u7684\u5347\u9ad8\uff1a<\/p>\n
                                                <\/div><\/figure>\n
                                                2.3.5 \u9650\u5236<\/h4>\n
                                                \u8fd9\u79cd\u65b9\u5f0f\u8981\u6c42 TCP \u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5728\u81ea\u5df1\u7684\u63a7\u5236\u4e4b\u5185\uff0c\u56e0\u6b64<\/p>\n
                                                  \n
                                                • \n
                                                  \n
                                                  \u5bf9\u5178\u578b\u7684\u6570\u636e\u4e2d\u5fc3\u5185\u90e8\u8bbf\u95ee\u6bd4\u8f83\u6709\u7528\uff1b<\/p>\n<\/section>\n<\/li>\n
                                                • \n
                                                  \n
                                                  \u8981\u7528\u4e8e\u6570\u636e\u4e2d\u5fc3\u5916\u7684 TCP \u5ba2\u6237\u7aef\uff0c\u5c31\u8981\u8ba9\u540e\u8005\u5c06\u5e26\u7ed9\u5b83\u4eec\u7684 server_id \u518d\u5e26\u56de\u6765\uff0c\u4f46\u8fd9\u4e2a\u57fa\u672c\u505a\u4e0d\u5230\uff1b<\/p>\n
                                                  \u5373\u4f7f\u5b83\u4eec\u5e26\u4e0a\u4e86\uff0c\u7f51\u7edc\u4e2d\u95f4\u5904\u7406\u8282\u70b9\uff08middleboxes\uff09\u548c\u9632\u706b\u5899\uff08firewalls\uff09\u4e5f\u53ef\u80fd\u4f1a\u5c06\u8fd9\u4e9b\u4fe1\u606f\u4e22\u5f03\u3002<\/p>\n<\/section>\n<\/li>\n<\/ul>\n
                                                  2.4 \u5c0f\u7ed3<\/h3>\n
                                                  \u901a\u8fc7\u5c06 server_id \u5d4c\u5165 TCP \u5934\u4e2d\uff0c\u6211\u4eec\u5b9e\u73b0\u4e86\u4e00\u79cd stateless routing \u673a\u5236\uff0c<\/p>\n
                                                    \n
                                                  • \n
                                                    \u8fd9\u662f\u4e00\u4e2a\u5b8c\u5168\u65e0\u72b6\u6001\u7684\u65b9\u6848<\/section>\n<\/li>\n
                                                  • \n
                                                    \u989d\u5916\u5f00\u9500\uff08CPU \/ memory\uff09\u975e\u5e38\u5c0f\uff0c\u57fa\u672c\u611f\u77e5\u4e0d\u5230<\/section>\n<\/li>\n
                                                  • \n
                                                    \u5176\u4ed6\u7ade\u54c1\u65b9\u6848\u90fd\u975e\u5e38\u590d\u6742\uff0c\u4f8b\u5982\u5728 hosts \u4e4b\u95f4\u5171\u4eab\u72b6\u6001\uff0c\u6216\u8005\u5c06 server_id \u5d4c\u5165\u5230 ECR (Echo Reply) \u65f6\u95f4\u6233\u5b57\u6bb5\u3002<\/section>\n<\/li>\n<\/ul>\n
                                                    3 \u9009\u62e9 socket\uff1a\u670d\u52a1\u7684\u771f\u6b63\u4f18\u96c5\u53d1\u5e03\uff08\u4e03\u5c42\u8d1f\u8f7d\u5747\u8861\uff09<\/span><\/h2>\n
                                                    \u524d\u9762\u4ecb\u7ecd\u4e86\u6d41\u91cf\u5982\u4f55\u4ece\u516c\u7f51\u7ecf\u8fc7\u5185\u7f51 LB \u5230\u8fbe backend \u4e3b\u673a\u3002\u518d\u6765\u770b\u5728\u4e3b\u673a\u5185\uff0c\u5982\u4f55\u8def\u7531\u6d41\u91cf\u6765\u4fdd\u8bc1\u4e03\u5c42\u670d\u52a1\uff08L7 service\uff09\u53d1\u5e03\u6216\u91cd\u542f\u65f6\u4e0d\u635f\u5931\u4efb\u4f55\u6d41\u91cf\u3002<\/p>\n
                                                    \u8fd9\u90e8\u5206\u5185\u5bb9\u5728 SIGCOMM 2020 \u8bba\u6587\u4e2d\u6709\u8be6\u7ec6\u4ecb\u7ecd\u3002\u60f3\u4e86\u89e3\u7ec6\u8282\u7684\u53ef\u53c2\u8003\uff1a<\/p>\n
                                                    \n
                                                    Facebook,Zero Downtime Release: Disruption-free Load Balancing of a Multi-Billion User Website<\/span>[5]<\/sup>. SIGCOMM 2020<\/p>\n<\/blockquote>\n
                                                    3.1 \u5f53\u524d\u53d1\u5e03\u65b9\u5f0f\u53ca\u5b58\u5728\u7684\u95ee\u9898<\/h3>\n
                                                    L7LB Proxygen \u81ea\u8eab\u4e5f\u662f\u4e00\u4e2a\u4e03\u5c42\u670d\u52a1\uff0c\u6211\u4eec\u4ee5\u5b83\u7684\u5347\u7ea7\u4e3a\u4f8b\u6765\u770b\u4e00\u4e0b\u5f53\u524d\u53d1\u5e03\u6d41\u7a0b\u3002<\/p>\n
                                                    3.1.1 \u53d1\u5e03\u6d41\u7a0b<\/h4>\n
                                                      \n
                                                    1. \n
                                                      \u53d1\u5e03\u524d\u72b6\u6001\uff1aProxygen \u5b9e\u4f8b\u4e0a\u6709\u4e00\u4e9b\u8001\u8fde\u63a5\uff0c\u4e5f\u5728\u4e0d\u65ad\u63a5\u53d7\u65b0\u8fde\u63a5\uff0c<\/section>\n<\/li>\n<\/ol>\n
                                                      <\/div><\/figure>\n
                                                        \n
                                                      1. \n
                                                        \n
                                                        \u62c9\u51fa\uff1a\u62c9\u51fa\u4e4b\u540e\u7684\u5b9e\u4f8b\u4e0d\u518d\u63a5\u53d7\u65b0\u8fde\u63a5\uff0c\u4f46\u5728\u4e00\u5b9a\u65f6\u95f4\u7a97\u53e3\u5185\uff0c\u7ee7\u7eed\u4e3a\u8001\u8fde\u63a5\u63d0\u4f9b\u670d\u52a1\uff1b<\/p>\n
                                                        <\/div><\/figure>\n<\/section>\n
                                                          \n
                                                        1. \n
                                                          \u8fd9\u4e2a\u7a97\u53e3\u79f0\u4e3a graceful shutdown\uff08\u4e5f\u53eb draining\uff09 period\uff0c\u4f8b\u5982\u8bbe\u7f6e\u4e3a 5 \u6216 10 \u5206\u949f\uff1b<\/section>\n<\/li>\n
                                                        2. \n
                                                          \u62c9\u51fa\u4e00\u822c\u662f\u901a\u8fc7\u5c06 downstream service \u7684\u5065\u5eb7\u76d1\u6d4b\u7f6e\u4e3a false \u6765\u5b9e\u73b0\u7684\uff0c\u4f8b\u5982\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5c31\u662f\u8ba9 Proxygen \u8fd4\u56de\u7ed9 katran \u7684\u5065\u5eb7\u76d1\u6d4b\u662f\u5931\u8d25\u7684\u3002<\/section>\n<\/li>\n<\/ol>\n<\/li>\n
                                                        3. \n
                                                          \n
                                                          \u53d1\u5e03\u65b0\u4ee3\u7801\uff1agraceful \u7a97\u53e3\u6bb5\u8fc7\u4e86\u4e4b\u540e\uff0c\u4e0d\u7ba1\u5b83\u4e0a\u9762\u8fd8\u6709\u6ca1\u6709\u8001\u8fde\u63a5\uff0c\u76f4\u63a5\u5f00\u59cb\u5347\u7ea7\u3002<\/p>\n
                                                          <\/div><\/figure>\n
                                                          \u4e00\u822c\u6765\u8bf4\uff0c\u53ea\u8981 graceful \u65f6\u95f4\u6bb5\u8bbe\u7f6e\u6bd4\u8f83\u5408\u9002\uff0c\u4e00\u90e8\u5206\u751a\u81f3\u5168\u90e8\u8001\u8fde\u63a5\u80fd\u591f\u5728\u8fd9\u4e2a \u7a97\u53e3\u5185\u6b63\u5e38\u9000\u51fa\uff0c\u4ece\u800c\u4e0d\u4f1a\u5f15\u8d77\u7528\u6237\u53ef\u89c1\u7684 spike\uff1b\u4f46\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679c\u6b64\u65f6\u4ecd\u7136\u6709\u8001 \u8fde\u63a5\uff0c\u90a3\u8fd9\u4e9b\u5ba2\u6237\u7aef\u5c31\u4f1a\u6536\u5230 tcp reset\u3002<\/p>\n<\/section>\n
                                                            \n
                                                          1. \n
                                                            \u90e8\u7f72\u65b0\u4ee3\u7801\uff0c<\/section>\n<\/li>\n
                                                          2. \n
                                                            \u5173\u95ed\u73b0\u6709\u8fdb\u7a0b\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u8fdb\u7a0b\u8fd0\u884c\u65b0\u4ee3\u7801\u3002<\/section>\n<\/li>\n<\/ol>\n<\/li>\n
                                                          3. \n
                                                            \n
                                                            \u76d1\u542c\u5e76\u63a5\u53d7\u65b0\u8fde\u63a5\uff1a\u5347\u7ea7\u4e4b\u540e\u7684 Proxygen \u5f00\u59cb\u6b63\u5e38\u5de5\u4f5c\uff0c \u6700\u7ec8\u8fbe\u5230\u548c\u5347\u7ea7\u4e4b\u524d\u540c\u7b49\u6c34\u5e73\u7684\u4e00\u4e2a\u8fde\u63a5\u72b6\u6001\u3002<\/p>\n
                                                            <\/div><\/figure>\n<\/section>\n<\/li>\n<\/ol>\n
                                                            3.1.2 \u5b58\u5728\u7684\u95ee\u9898<\/h4>\n
                                                            \u5f88\u591a\u516c\u53f8\u90fd\u662f\u7528\u7684\u4ee5\u4e0a\u90a3\u79cd\u53d1\u5e03\u65b9\u5f0f\uff0c\u5b83\u7684\u5b9e\u73b0\u6210\u672c\u6bd4\u8f83\u4f4e\uff0c\u4f46\u4e5f\u5b58\u5728\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n
                                                              \n
                                                            1. \n
                                                              \n
                                                              \u53d1\u5e03\u8fc7\u7a0b\u4e2d\uff0c\u7cfb\u7edf\u5bb9\u91cf\u4f1a\u964d\u4f4e\u3002<\/p>\n
                                                              \u4ece graceful shutdown \u5f00\u59cb\uff0c\u5230\u65b0\u4ee3\u7801\u5df2\u7ecf\u63a5\u5165\u4e86\u6b63\u5e38\u91cf\u7ea7\u7684\u6d41\u91cf\uff0c\u8fd9\u6bb5\u65f6\u95f4\u5185 \u7cfb\u7edf\u5bb9\u91cf\u5e76\u6ca1\u6709\u8fbe\u5230\u7cfb\u7edf\u8d44\u6e90\u6240\u80fd\u652f\u6491\u7684\u6700\u5927\u503c\uff0c \u4f8b\u5982\u4e09\u4e2a backend \u672c\u6765\u6700\u5927\u80fd\u652f\u6491 3N \u4e2a\u8fde\u63a5\uff0c\u90a3\u5728\u5347\u7ea7\u5176\u4e2d\u4e00\u53f0\u7684\u65f6\u95f4\u6bb5\u5185\uff0c\u7cfb\u7edf\u80fd\u652f\u6491\u7684\u6700\u5927\u8fde\u63a5\u6570\u5c31\u4f1a\u5c0f\u4e8e 3N\uff0c\u5728 2N~3N \u4e4b\u95f4\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u5f88\u591a\u516c\u53f8\u90fd\u907f\u514d\u5728\u4e1a\u52a1\u9ad8\u5cf0\uff08\u800c\u662f\u9009\u62e9\u7c7b\u4f3c\u5468\u65e5\u51cc\u6668\u4e94\u70b9\u8fd9\u6837\u7684\u65f6\u95f4\u70b9\uff09\u505a\u8fd9\u79cd\u53d8\u66f4\u7684\u539f\u56e0\u4e4b\u4e00\u3002<\/p>\n<\/section>\n<\/li>\n
                                                            2. \n
                                                              \n
                                                              \u53d1\u5e03\u5468\u671f\u592a\u957f<\/p>\n
                                                              \u5047\u8bbe\u6709 100 \u53f0\u673a\u5668\uff0c\u5206\u6210 100 \u4e2a\u6279\u6b21\uff08phase\uff09\uff0c\u6bcf\u6b21\u53d1\u5e03\u4e00\u53f0\uff0c \u5982\u679c graceful time \u662f 10 \u5206\u949f\uff0c\u4e00\u6b21\u53d1\u5e03\u5c31\u9700\u8981 1000 \u5206\u949f\uff0c\u663e\u7136\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\u3002<\/p>\n
                                                              \u672c\u8d28\u4e0a\u6765\u8bf4\uff0c\u8fd9\u79cd\u65b9\u5f0f\u6269\u5c55\u6027\u592a\u5dee\uff0c\u4e3b\u673a\u6216\u5b9e\u4f8b\u6570\u91cf\u4e00\u591a\u6548\u7387\u5c31\u975e\u5e38\u4f4e\u4e86\u3002<\/p>\n<\/section>\n<\/li>\n<\/ol>\n
                                                              3.2 \u4e0d\u635f\u5931\u5bb9\u91cf\u3001\u5feb\u901f\u4e14\u7528\u6237\u65e0\u611f\u7684\u53d1\u5e03<\/h3>\n
                                                              \u4ee5\u4e0a\u5206\u6790\u5f15\u51fa\u7684\u6838\u5fc3\u95ee\u9898\u662f\uff1a\u5982\u4f55\u5728\u7528\u6237\u65e0\u611f\u77e5\u7684\u524d\u63d0\u4e0b\uff0c\u4e0d\u635f\u5931\u5bb9\u91cf\uff08without losing capacity\uff09\u4e14\u975e\u5e38\u5feb\u901f\uff08very high velocity\uff09\u5730\u5b8c\u6210\u53d1\u5e03\u3002<\/p>\n
                                                              3.2.1 \u65e9\u671f\u65b9\u6848\uff1asocket takeover (or zero downtime restart)<\/h4>\n
                                                              \u6211\u4eec\u5728\u65e9\u671f\u81ea\u5df1\u5b9e\u73b0\u4e86\u4e00\u4e2a\u6240\u8c13\u7684 zero downtime restart \u6216\u79f0 socket takeover \u65b9\u6848\u3002\u5177\u4f53\u7ec6\u8282\u89c1\u524d\u9762\u63d0\u5230\u7684 LPC \u8bba\u6587\uff0c\u8fd9\u91cc\u53ea\u63cf\u8ff0\u4e0b\u5927\u6982\u539f\u7406\uff1a\u76f8\u6bd4\u4e8e\u7b49\u5f85\u8001\u8fdb\u7a0b\u7684\u8fde\u63a5\u5b8c\u5168\u9000\u51fa\u518d\u5f00\u59cb\u53d1\u5e03\uff0c\u6211\u4eec\u7684\u505a\u6cd5\u662f\u76f4\u63a5\u521b\u5efa\u4e00\u4e2a\u65b0\u8fdb\u7a0b\uff0c\u7136\u540e\u901a\u8fc7\u4e00\u4e2a\u552f \u4e00\u7684 local socket \u5c06\u8001\u8fdb\u7a0b\u4e2d TCP listen socket \u548c UDP sockets \u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 \uff08\u4ee5\u53ca SCM rights\uff09\u8f6c\u79fb\u5230\u65b0\u8fdb\u7a0b\u3002<\/p>\n
                                                              \u53d1\u5e03\u6d41\u7a0b<\/h5>\n
                                                              \u5982\u4e0b\u56fe\u6240\u793a\uff0c\u53d1\u5e03\u524d\uff0c\u5b9e\u4f8b\u6b63\u5e38\u8fd0\u884c\uff0c\u540c\u65f6\u63d0\u4f9b TCP \u548c UDP \u670d\u52a1\uff0c\u5176\u4e2d\uff0c<\/p>\n
                                                                \n
                                                              • \n
                                                                TCP socket \u5206\u4e3a\u4e24\u90e8\u5206\uff1a\u5df2\u63a5\u53d7\u7684\u8fde\u63a5\uff08\u7f16\u53f7 1~N\uff09\u548c\u76d1\u542c\u65b0\u8fde\u63a5\u7684 listening socket<\/section>\n<\/li>\n
                                                              • \n
                                                                UDP socket\uff0cbind \u5728 VIP \u4e0a<\/section>\n<\/li>\n<\/ul>\n
                                                                <\/div><\/figure>\n
                                                                \u63a5\u4e0b\u6765\u5f00\u59cb\u53d1\u5e03\uff1a<\/p>\n
                                                                  \n
                                                                1. \n
                                                                  \u521b\u5efa\u4e00\u4e2a\u65b0\u5b9e\u4f8b<\/section>\n<\/li>\n
                                                                2. \n
                                                                  \u5c06 TCP listening socket \u548c UDP VIP \u8fc1\u79fb\u5230\u65b0\u5b9e\u4f8b\uff1b\u8001\u5b9e\u4f8b\u4ecd\u7136 serving \u73b0\u6709 TCP \u8fde\u63a5\uff081 ~ N<\/code>\uff09\uff0c<\/section>\n<\/li>\n
                                                                3. \n
                                                                  \u65b0\u5b9e\u4f8b\u5f00\u59cb\u63a5\u53d7\u65b0\u8fde\u63a5\uff08N+1 ~ +\u221e<\/code>\uff09\uff0c\u5305\u62ec\u65b0\u7684 TCP \u8fde\u63a5\u548c\u65b0\u7684 UDP \u8fde\u63a5<\/section>\n<\/li>\n
                                                                4. \n
                                                                  \u8001\u5b9e\u4f8b\u7b49\u5f85 drain<\/section>\n<\/li>\n<\/ol>\n
                                                                  \u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u79cd\u65b9\u5f0f\uff1a<\/p>\n
                                                                    \n
                                                                  1. \n
                                                                    \u5728\u53d1\u5e03\u671f\u95f4\u4e0d\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u5bb9\u5668\u964d\u4f4e\uff0c\u56e0\u4e3a\u6211\u4eec\u5b8c\u5168\u4fdd\u7559\u4e86\u8001\u5b9e\u4f8b\uff0c\u53e6\u5916\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u5b9e\u4f8b<\/section>\n<\/li>\n
                                                                  2. \n
                                                                    \u53d1\u5e03\u901f\u5ea6\u53ef\u4ee5\u663e\u7740\u52a0\u5feb\uff0c\u56e0\u4e3a\u6b64\u65f6\u53ef\u4ee5\u5e76\u53d1\u53d1\u5e03\u591a\u4e2a\u5b9e\u4f8b<\/section>\n<\/li>\n
                                                                  3. \n
                                                                    \u8001\u8fde\u63a5\u88ab reset \u7684\u6982\u7387\u53ef\u4ee5\u5927\u5927\u964d\u4f4e\uff0c\u53ea\u8981\u5141\u8bb8\u8001\u5b9e\u4f8b\u6709\u8db3\u591f\u7684 drain \u7a97\u53e3<\/section>\n<\/li>\n<\/ol>\n
                                                                    \u90a3\u4e48\uff0c\u8fd9\u79cd\u65b9\u5f0f\u6709\u4ec0\u4e48\u7f3a\u70b9\u5417\uff1f<\/p>\n
                                                                    \u5b58\u5728\u7684\u95ee\u9898<\/h5>\n
                                                                    \u4e00\u4e2a\u663e\u800c\u6613\u89c1\u7684\u7f3a\u70b9\u662f\uff1a\u8fd9\u79cd\u53d1\u5e03\u65b9\u5f0f\u9700\u8981\u66f4\u591a\u7684\u7cfb\u7edf\u8d44\u6e90\uff0c\u56e0\u4e3a\u5bf9\u4e8e\u6bcf\u4e2a\u8981\u5347\u7ea7\u7684\u5b9e\u4f8b \uff0c\u5b83\u7684\u65b0\u8001\u5b9e\u4f8b\u9700\u8981\u5e76\u884c\u8fd0\u884c\u4e00\u6bb5\u65f6\u95f4\uff1b\u800c\u5728\u4e4b\u524d\u53d1\u5e03\u6a21\u578b\u662f\u5e72\u6389\u8001\u5b9e\u4f8b\u518d\u521b\u5efa\u65b0\u5b9e\u4f8b\uff0c \u4e0d\u4f1a\u540c\u65f6\u8fd0\u884c\u3002<\/p>\n
                                                                    \u4f46\u6211\u4eec\u4eca\u5929\u8981\u8ba8\u8bba\u7684\u662f\u53e6\u4e00\u4e2a\u95ee\u9898\uff1aUDP \u6d41\u91cf\u7684\u5206\u53d1\u6216\u79f0\u89e3\u590d\u7528\uff08de-multiplex\uff09\u3002<\/p>\n
                                                                      \n
                                                                    • \n
                                                                      TCP \u7684\u72b6\u6001\u7ef4\u62a4\u5728\u5185\u6838\u3002<\/section>\n<\/li>\n
                                                                    • \n
                                                                      UDP \u534f\u8bae \u2014\u2014 \u5c24\u5176\u662f\u7ef4\u62a4\u8fde\u63a5\u72b6\u6001\u7684 UDP \u534f\u8bae\uff0c\u5177\u4f53\u6765\u8bf4\u5c31\u662f QUIC \u2014\u2014 \u6240\u6709 \u72b6\u6001\u7ef4\u62a4\u5728\u5e94\u7528\u5c42\u800c\u975e\u5185\u6838\uff0c\u56e0\u6b64\u5185\u6838\u5b8c\u5168\u6ca1\u6709 QUIC \u7684\u4e0a\u4e0b\u6587\u3002<\/section>\n<\/li>\n<\/ul>\n
                                                                      \u7531\u4e8e socket \u8fc1\u79fb\u662f\u5728\u5185\u6838\u505a\u7684\uff0c\u800c\u5185\u6838\u6ca1\u6709 QUIC \u4e0a\u4e0b\u6587\uff08\u5728\u5e94\u7528\u5c42\u7ef4\u62a4\uff09\uff0c\u56e0\u6b64 \u5f53\u65b0\u8001\u8fdb\u7a0b\u540c\u65f6\u8fd0\u884c\u65f6\uff0c\u5185\u6838\u65e0\u6cd5\u77e5\u9053\u5bf9\u4e8e\u4e00\u4e2a\u73b0\u6709 UDP \u8fde\u63a5\u7684\u5305\uff0c\u5e94\u8be5\u9001\u7ed9\u54ea\u4e2a\u8fdb\u7a0b \uff08\u56e0\u4e3a\u5bf9\u4e8e QUIC \u6ca1\u6709 listening socket \u6216 accepted socket \u7684\u6982\u5ff5\uff09\uff0c\u56e0\u6b64\u6709\u4e9b\u5305\u4f1a\u5230\u8001\u8fdb\u7a0b\uff0c\u6709\u4e9b\u5230\u65b0\u8fdb\u7a0b\uff0c\u5982\u4e0b\u56fe\u5de6\u8fb9\u6240\u793a\uff1b<\/p>\n
                                                                      <\/div><\/figure>\n
                                                                      \u4e3a\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5f15\u5165\u4e86\u7528\u6237\u7a7a\u95f4\u89e3\u51b3\u65b9\u6848\u3002\u4f8b\u5982\u5728 QUIC \u573a\u666f\u4e0b\uff0c\u4f1a\u67e5\u770b ConnectionID \u7b49 QUIC \u89c4\u8303\u4e2d\u5141\u8bb8\u643a\u5e26\u7684\u5143\u4fe1\u606f\uff0c\u7136\u540e\u6839\u636e\u8fd9\u4e9b\u4fe1\u606f\uff0c\u901a\u8fc7\u53e6\u4e00\u4e2a local socket \u8f6c\u53d1\u7ed9\u76f8\u5e94\u7684\u8001\u8fdb\u7a0b\uff0c\u5982\u4ee5\u4e0a\u53f3\u56fe\u6240\u793a\u3002<\/p>\n
                                                                      \u867d\u7136\u80fd\u89e3\u51b3 QUIC \u7684\u95ee\u9898\uff0c\u4f46\u53ef\u4ee5\u770b\u51fa\uff0c\u8fd9\u79cd\u65b9\u5f0f\u975e\u5e38\u590d\u6742\u548c\u8106\u5f31\uff0c\u6d89\u53ca\u5230\u5927\u91cf\u8fdb\u7a0b\u95f4\u901a\u4fe1\uff0c\u9700\u8981\u7ef4\u62a4\u8bb8\u591a\u72b6\u6001\u3002\u6709\u6ca1\u6709\u7b80\u5355\u7684\u65b9\u5f0f\u5462\uff1f<\/p>\n
                                                                      3.2.2 \u5176\u4ed6\u65b9\u6848\u8c03\u7814\uff1aSO_REUSEPORT<\/h4>\n
                                                                      Socket takeover \u65b9\u6848\u590d\u6742\u6027\u548c\u8106\u5f31\u6027\u7684\u6839\u6e90\u5728\u4e8e\uff1a\u4e3a\u4e86\u505a\u5230\u5ba2\u6237\u7aef\u65e0\u611f\uff0c\u6211\u4eec\u5728\u4e24\u4e2a\u8fdb\u7a0b\u95f4\u5171\u4eab\u4e86\u540c\u4e00\u4e2a socket\u3002\u56e0\u6b64\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5c31\u8981\u907f\u514d\u5728\u591a\u4e2a\u8fdb\u7a0b\u4e4b\u95f4\u5171\u4eab socket\u3002<\/p>\n
                                                                      \u8fd9\u81ea\u7136\u4f7f\u6211\u4eec\u60f3\u5230\u4e86 SO_REUSEPORT<\/span>[6]<\/sup>: \u00a0\u5b83\u5141\u8bb8 \u591a\u4e2a socket bind \u5230\u540c\u4e00\u4e2a port\u3002\u4f46\u8fd9\u91cc\u4ecd\u7136\u6709\u4e00\u4e2a\u95ee\u9898\uff1aUDP \u5305\u7684\u8def\u7531\u8fc7\u7a0b\u662f\u975e\u4e00\u81f4\u7684\uff08no consistent routing for UDP packets\uff09\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
                                                                      <\/div><\/figure>\n
                                                                      \u5982\u679c\u65b0\u8001\u5b9e\u4f8b\u7684 UDP socket bind \u5230\u76f8\u540c\u7aef\u53e3\uff0c\u90a3\u4e00\u4e2a\u5b9e\u4f8b\u91cd\u542f\u65f6\uff0c\u54c8\u5e0c\u7ed3\u679c\u5c31\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u5bfc\u81f4\u8fd9\u4e2a\u7aef\u53e3\u4e0a\u7684\u5305\u53d1\u751f misrouting\u3002<\/p>\n
                                                                      \u53e6\u4e00\u65b9\u9762\uff0cSO_REUSEPORT \u8fd8\u6709\u6027\u80fd\u95ee\u9898\uff0c<\/p>\n
                                                                        \n
                                                                      • \n
                                                                        TCP \u662f\u6709\u4e00\u4e2a\u72ec\u7acb\u7ebf\u7a0b\u8d1f\u8d23\u63a5\u53d7\u8fde\u63a5\uff0c\u7136\u540e\u5c06\u65b0\u8fde\u63a5\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8f6c\u7ed9\u5176\u4ed6\u7ebf\u7a0b \uff0c\u8fd9\u79cd\u673a\u5236\u5728\u8d1f\u8f7d\u5747\u8861\u5668\u4e2d\u975e\u5e38\u5178\u578b\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u662f\u5728 socket \u5c42\u505a\u5206\u53d1\uff1b<\/section>\n<\/li>\n
                                                                      • \n
                                                                        UDP \u72b6\u6001\u5728\u5e94\u7528\u5c42\uff0c\u56e0\u6b64\u5185\u6838\u53ea\u80fd\u5728 packet \u5c42\u505a\u5206\u53d1\uff0c \u8d1f\u8d23\u76d1\u542c UDP \u65b0\u8fde\u63a5\u7684\u5355\u4e2a\u7ebf\u6027\u4e0d\u4f46\u8981\u5904\u7406\u65b0\u8fde\u63a5\uff0c\u8fd8\u8d1f\u8d23\u5305\u7684\u5206\u53d1\uff0c\u663e\u7136\u4f1a\u5b58\u5728\u74f6\u9888\u548c\u6269\u5c55\u6027\u95ee\u9898\u3002<\/section>\n<\/li>\n<\/ul>\n
                                                                        <\/div><\/figure>\n
                                                                        \u56e0\u6b64\u76f4\u63a5\u4f7f\u7528 SO_REUSEPORT \u662f\u4e0d\u884c\u7684\u3002<\/p>\n
                                                                        3.2.3 \u601d\u8003<\/h4>\n
                                                                        \u6211\u4eec\u540e\u9000\u4e00\u6b65\uff0c\u91cd\u65b0\u601d\u8003\u4e00\u4e0b\u6211\u4eec\u7684\u6838\u5fc3\u9700\u6c42\u662f\u4ec0\u4e48\u3002\u6709\u4e24\u70b9\uff1a<\/p>\n
                                                                          \n
                                                                        1. \n
                                                                          \u5728\u5185\u6838\u4e2d\u5b9e\u73b0\u6d41\u91cf\u7684\u65e0\u635f\u5207\u6362\uff0c\u4ee5\u4fbf\u5ba2\u6237\u7aef\u5b8c\u5168\u65e0\u611f\u77e5\uff1b<\/section>\n<\/li>\n
                                                                        2. \n
                                                                          \u8fc7\u7a0b\u80fd\u505a\u5230\u5feb\u901f\u548c\u53ef\u6269\u5c55\uff0c\u4e0d\u5b58\u5728\u660e\u663e\u6027\u80fd\u74f6\u9888\uff1b<\/section>\n<\/li>\n<\/ol>\n
                                                                          \u5185\u6838\u63d0\u4f9b\u4e86\u5f88\u591a\u529f\u80fd\uff0c\u4f46\u5e76\u6ca1\u6709\u54ea\u4e2a\u529f\u80fd\u662f\u4e3a\u4e13\u95e8\u8fd9\u4e2a\u573a\u666f\u8bbe\u8ba1\u7684\u3002\u56e0\u6b64\u8981\u5f7b\u5e95\u89e3\u51b3\u95ee\u9898\uff0c\u6211\u4eec\u5fc5\u987b\u5f15\u5165\u67d0\u79cd\u521b\u65b0\u3002<\/p>\n
                                                                            \n
                                                                          • \n
                                                                            \u7406\u8bba\u4e0a\uff1a\u53ea\u8981\u6211\u4eec\u80fd\u63a7\u5236\u4e3b\u673a\u5185\u5305\u7684\u8def\u7531\u8fc7\u7a0b\uff08routing of the packets within a host\uff09\uff0c\u90a3\u4ee5\u4e0a\u9700\u6c42\u5c31\u5f88\u5bb9\u6613\u6ee1\u8db3\u4e86\u3002<\/section>\n<\/li>\n
                                                                          • \n
                                                                            \u5b9e\u73b0\u4e0a\uff1a\u4ecd\u7136\u57fa\u4e8e SO_REUSEPORT \u601d\u60f3\uff0c\u4f46\u540c\u65f6\u89e3\u51b3 UDP \u7684\u4e00\u81f4\u6027\u8def\u7531\u548c\u74f6\u9888\u95ee\u9898\u3002<\/section>\n<\/li>\n<\/ul>\n
                                                                            \u6700\u7ec8\u6211\u4eec\u5f15\u5165\u4e86\u4e00\u4e2a socket \u5c42\u8d1f\u8f7d\u5747\u8861\u5668 bpf_sk_reuseport\u3002<\/p>\n
                                                                            3.3 \u65b0\u65b9\u6848\uff1abpf_sk_reuseport<\/code><\/h3>\n
                                                                            3.3.1 \u65b9\u6848\u8bbe\u8ba1<\/h4>\n
                                                                            \u7b80\u5355\u6765\u8bf4\uff0c<\/p>\n
                                                                              \n
                                                                            1. \n
                                                                              \u5728 socket \u5c42 attach \u4e00\u6bb5 BPF \u7a0b\u5e8f\uff0c\u63a7\u5236 TCP\/UDP \u6d41\u91cf\u7684\u8f6c\u53d1\uff08\u8d1f\u8f7d\u5747\u8861\uff09:<\/section>\n<\/li>\n
                                                                            2. \n
                                                                              \u901a\u8fc7\u4e00\u4e2a BPF map \u7ef4\u62a4\u914d\u7f6e\u4fe1\u606f\uff0c\u4e1a\u52a1\u8fdb\u7a0b ready \u4e4b\u540e\u81ea\u5df1\u914d\u7f6e\u6d41\u91cf\u5207\u6362\u3002<\/section>\n<\/li>\n<\/ol>\n
                                                                              3.3.2 \u597d\u5904<\/h4>\n
                                                                              \u8fd9\u79cd\u8bbe\u8ba1\u7684\u597d\u5904\uff1a<\/p>\n
                                                                                \n
                                                                              1. \n
                                                                                \n
                                                                                \u901a\u7528\uff0c\u80fd\u5904\u7406\u591a\u79cd\u7c7b\u578b\u7684\u534f\u8bae\u3002<\/p>\n<\/section>\n<\/li>\n
                                                                              2. \n
                                                                                \n
                                                                                \u5728 VIP \u5c42\u9762\uff0c\u80fd\u66f4\u597d\u5730\u63a7\u5236\u65b0\u8fdb\u7a0b\uff08\u65b0\u5b9e\u4f8b\uff09\u542f\u52a8\u540e\u7684\u6d41\u91cf\u63a5\u5165\u8fc7\u7a0b\uff0c\u4f8b\u5982<\/p>\n
                                                                                Proxygen \u5728\u542f\u52a8\u65f6\u7ecf\u5e38\u8981\u505a\u4e00\u4e9b\u521d\u59cb\u5316\u64cd\u4f5c\uff0c\u542f\u52a8\u540e\u505a\u4e00\u4e9b\u5065\u5eb7\u68c0\u6d4b\u5de5\u4f5c\uff0c \u56e0\u6b64\u5728\u771f\u6b63\u5f00\u59cb\u5e72\u6d3b\u4e4b\u524d\u8fd8\u6709\u4e00\u6bb5\u5e76\u672a ready \u63a5\u6536\u8bf7\u6c42\/\u6d41\u91cf\u7684\u7a97\u53e3 \u2014\u2014 \u5373\u4f7f\u5b83\u6b64\u65f6\u5df2\u7ecf bind \u5230\u7aef\u53e3\u4e86\u3002<\/p>\n
                                                                                \u5728\u65b0\u65b9\u6848\u4e2d\uff0c\u6211\u4eec\u65e0\u9700\u5173\u5fc3\u8fd9\u4e9b\uff0c\u5e94\u7528\u5c42\u81ea\u5df1\u4f1a\u5224\u65ad\u65b0\u8fdb\u7a0b\u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5\u63a5\u53d7\u6d41\u91cf \u5e76\u901a\u77e5 BPF \u7a0b\u5e8f\u505a\u6d41\u91cf\u5207\u6362\uff1b<\/p>\n<\/section>\n<\/li>\n
                                                                              3. \n
                                                                                \n
                                                                                \u6027\u80fd\u65b9\u9762\uff0c\u4e5f\u89e3\u51b3\u4e86\u524d\u9762\u63d0\u5230\u7684 UDP \u5355\u7ebf\u7a0b\u74f6\u9888\uff1b<\/p>\n<\/section>\n<\/li>\n
                                                                              4. \n
                                                                                \n
                                                                                \u5728\u5305\u7684\u8def\u7531\uff08packet-level routing\uff09\u65b9\u9762\uff0c\u8fd8\u652f\u6301\u6839\u636e CPU \u8c03\u6574\u8def\u7531\u6743\u91cd\uff08adjust weight of traffic per-cpu\uff09\u3002\u4f8b\u5982\u5728\u591a\u79df\u6237\u73af\u5883\u4e2d\uff0cCPU \u7684\u5229\u7528\u7387\u53ef\u80fd\u5e76\u4e0d\u5747\u5300\uff0c\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u9700\u8981\u5b9e\u73b0\u7279\u5b9a\u7b97\u6cd5\u6765\u8c03\u5ea6\uff0c\u4f8b\u5982\u9009\u62e9\u7a7a\u95f2\u7684 CPU\u3002<\/p>\n<\/section>\n<\/li>\n
                                                                              5. \n
                                                                                \n
                                                                                \u6700\u540e\uff0c\u672a\u6765\u8fed\u4ee3\u975e\u5e38\u7075\u6d3b\uff0c\u80fd\u652f\u6301\u591a\u79cd\u65b0\u573a\u666f\u7684\u5b9e\u9a8c\uff0c\u4f8b\u5982\u8ba9\u6bcf\u4e2a\u6536\u5230\u5305\u4ece CPU \u8d1f\u8d23\u5904\u7406\u8be5\u5305\uff0c\u6216\u8005 NUMA \u76f8\u5173\u7684\u8c03\u5ea6\u3002<\/p>\n<\/section>\n<\/li>\n<\/ol>\n
                                                                                3.3.3 \u53d1\u5e03\u8fc7\u7a0b\u4e2d\u7684\u6d41\u91cf\u5207\u6362\u8be6\u89e3<\/h4>\n
                                                                                \u7528\u4e00\u4e2a BPF_MAP_TYPE_REUSEPORT_SOCKARRAY<\/code> \u7c7b\u578b\u7684 BPF map \u6765\u914d\u7f6e\u8f6c\u53d1\u89c4\u5219\uff0c\u5176\u4e2d\uff0c<\/p>\n
                                                                                  \n
                                                                                • \n
                                                                                  key\uff1a<VIP>:<Port><\/code><\/section>\n<\/li>\n
                                                                                • \n
                                                                                  value\uff1asocket \u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u4e0e\u4e1a\u52a1\u8fdb\u7a0b\u4e00\u4e00\u5bf9\u5e94<\/section>\n<\/li>\n<\/ul>\n
                                                                                  \u5982\u4e0b\u56fe\u6240\u793a\uff0c\u5373\u4f7f\u65b0\u8fdb\u7a0b\u5df2\u7ecf\u8d77\u6765\uff0c\u4f46\u53ea\u8981\u8fd8\u6ca1 ready\uff08BPF map \u4e2d\u4ecd\u7136\u6307\u5411\u8001\u8fdb\u7a0b\uff09\uff0c<\/p>\n
                                                                                  <\/div><\/figure>\n
                                                                                  BPF \u5c31\u7ee7\u7eed\u5c06\u6240\u6709\u6d41\u91cf\u8f6c\u7ed9\u8001\u8fdb\u7a0b\uff0c<\/p>\n
                                                                                  <\/div><\/figure>\n
                                                                                  \u65b0\u8fdb\u7a0b ready \u540e\uff0c\u66f4\u65b0 BPF map\uff0c\u544a\u8bc9 BPF \u7a0b\u5e8f\u5b83\u53ef\u4ee5\u63a5\u6536\u6d41\u91cf\u4e86\uff1a<\/p>\n
                                                                                  <\/div><\/figure>\n
                                                                                  BPF \u7a0b\u5e8f\u5c31\u5f00\u59cb\u5c06\u6d41\u91cf\u8f6c\u53d1\u7ed9\u65b0\u8fdb\u7a0b\u4e86\uff1a<\/p>\n
                                                                                  <\/div><\/figure>\n
                                                                                  \u524d\u9762\u6ca1\u63d0\u7684\u4e00\u70b9\u662f\uff1a\u6211\u4eec\u4ecd\u7136\u5e0c\u671b\u5c06 UDP \u5305\u8f6c\u53d1\u5230\u8001\u8fdb\u7a0b\u4e0a\uff0c\u8fd9\u91cc\u5b9e\u73b0\u8d77\u6765\u5176\u5b9e\u5c31\u975e\u5e38\u7b80\u5355\u4e86\uff1a<\/p>\n
                                                                                    \n
                                                                                  1. \n
                                                                                    \u5df2\u7ecf\u7ef4\u62a4\u4e86 flow -> socket \u6620\u5c04<\/section>\n<\/li>\n
                                                                                  2. \n
                                                                                    \u5982\u679c flow \u5b58\u5728\uff0c\u5c31\u5c31\u8f6c\u53d1\u5230\u5bf9\u5e94\u7684 socket\uff1b\u4e0d\u5b58\u5728\u5728\u521b\u5efa\u4e00\u4e2a\u65b0\u6620\u5c04\uff0c\u8f6c\u53d1\u7ed9\u65b0\u5b9e\u4f8b\u7684 socket\u3002<\/section>\n<\/li>\n<\/ol>\n
                                                                                    \u8fd9\u4e5f\u89e3\u51b3\u4e86\u6269\u5c55\u6027\u95ee\u9898\uff0c\u73b0\u5728\u53ef\u4ee5\u5e76\u53d1\u63a5\u6536\u5305\uff08one-thread-per-socket\uff09\uff0c\u4e0d\u7528\u62c5\u5fc3\u65b0\u8fdb\u7a0b\u542f\u52a8\u65f6\u7684 disruptions \u6216 misrouting \u4e86\uff1a<\/p>\n
                                                                                    <\/div><\/figure>\n
                                                                                    3.3.4 \u65b0\u8001\u65b9\u6848\u6548\u679c\u5bf9\u6bd4<\/h4>\n
                                                                                    \u5148\u6765\u770b\u53d1\u5e03\u8fc7\u7a0b\u5bf9\u4e1a\u52a1\u6d41\u91cf\u7684\u6270\u52a8\u7a0b\u5ea6\u3002\u4e0b\u56fe\u662f\u6211\u4eec\u7684\u751f\u4ea7\u6570\u636e\u4e2d\u5fc3\u67d0\u6b21\u53d1\u5e03\u7684\u7edf\u8ba1\uff0c\u56fe\u4e2d\u6709\u4e24\u6761\u7ebf\uff1a<\/p>\n
                                                                                      \n
                                                                                    • \n
                                                                                      \u4e00\u6761\u662f\u5df2\u53d1\u5e03\u7684 server \u767e\u5206\u6bd4\uff0c<\/section>\n<\/li>\n
                                                                                    • \n
                                                                                      \u53e6\u4e00\u4e2a\u6761\u662f\u540c\u4e00\u65f6\u95f4\u7684\u4e22\u5305\u6570\u91cf\uff0c<\/section>\n<\/li>\n<\/ul>\n
                                                                                      <\/div><\/figure>\n
                                                                                      \u53ef\u4ee5\u770b\u5230\u5728\u6574\u4e2a\u5347\u7ea7\u671f\u95f4\uff0c\u4e22\u5305\u6570\u91cf\u6ca1\u6709\u660e\u663e\u53d8\u5316\u3002<\/p>\n
                                                                                      \u518d\u6765\u770b\u6d41\u91cf\u5206\u53d1\u6027\u80fd\uff0c\u5206\u522b\u5bf9 socket takeover \u548c bpf_sk_reuseport \u4e24\u79cd\u65b9\u5f0f\u52a0\u538b\uff1a<\/p>\n
                                                                                      <\/div><\/figure>\n
                                                                                        \n
                                                                                      • \n
                                                                                        \u63a7\u5236\u7ec4\/\u5bf9\u7167\u7ec4\uff08\u5de6\u8fb9\uff09\uff1a3x \u6d41\u91cf\u65f6\u5f00\u59cb\u4e22\u5305\uff0c<\/section>\n<\/li>\n
                                                                                      • \n
                                                                                        \u5b9e\u9a8c\u7ec4\uff08\u53f3\u8fb9\uff09\uff1a30x\uff0c\u56e0\u6b64\u8fd8\u6ca1\u6709\u5230\u5206\u53d1\u74f6\u9888\u4f46 CPU \u5df2\u7ecf\u7528\u6ee1\u4e86\uff0c\u4f46\u5373\u4f7f\u8fd9\u6837\u4e22\u5305\u4ecd\u7136\u5f88\u5c11\u3002<\/section>\n<\/li>\n<\/ul>\n
                                                                                        3.3.5 \u9047\u5230\u7684\u5751<\/h4>\n
                                                                                        \u751f\u4ea7\u73af\u5883\u9047\u5230\u8fc7\u4e00\u4e2a\u4e25\u91cd\u95ee\u9898\uff1a\u65b0\u8001\u8fdb\u7a0b\u540c\u65f6\u8fd0\u884c\u671f\u95f4\uff0c\u89c2\u5bdf\u5230 CPU spike \u751a\u81f3 host locking\uff1b\u4f46\u6d4b\u8bd5\u73af\u5883\u4ece\u6765\u6ca1\u51fa\u73b0\u8fc7\uff0c\u800c\u4e14\u5728\u5b9e\u73b0\u4e0a\u6211\u4eec\u4e5f\u6ca1\u6709\u7279\u522b\u6d88\u8017 CPU \u7684\u903b\u8f91\u3002<\/p>\n
                                                                                        \u6392\u67e5\u4e4b\u540e\u53d1\u73b0\uff0c\u8fd9\u4e2a\u95ee\u9898\u8ddf BPF \u7a0b\u5e8f\u6ca1\u5173\u7cfb\uff0c\u76f4\u63a5\u539f\u56e0\u662f<\/p>\n
                                                                                          \n
                                                                                        1. \n
                                                                                          \n
                                                                                          \u5728\u540c\u4e00\u4e2a netns \u5185\u6709\u5927\u91cf socket\uff0c<\/p>\n<\/section>\n<\/li>\n
                                                                                        2. \n
                                                                                          \n
                                                                                          \u65b0\u8001\u5b9e\u4f8b\u540c\u65f6\u4ee5\u652f\u6301\u548c\u4e0d\u652f\u6301 bpf_sk_reuseport \u7684\u65b9\u5f0f bind \u5230\u4e86\u540c\u4e00\u7aef\u53e3\uff0c<\/p>\n
                                                                                          bind<\/span>(\"[::1]:443\"<\/span>);\u00a0\/*\u00a0without\u00a0SO_REUSEPORT.\u00a0Succeed.\u00a0*\/\r\nbind<\/span>(\"[::2]:443\"<\/span>);\u00a0\/*\u00a0with\u00a0\u00a0\u00a0\u00a0SO_REUSEPORT.\u00a0Succeed.\u00a0*\/\r\nbind<\/span>(\"[::]:443\"<\/span>);\u00a0\u00a0\/*\u00a0with\u00a0\u00a0\u00a0\u00a0SO_REUSEPORT.\u00a0Still\u00a0Succeed\u00a0*\/\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
                                                                                        3. \n
                                                                                          \n
                                                                                          bind() \u5b9e\u73b0\u4e2d\u6709\u4e00\u4e2a spin lock \u4f1a\u904d\u5386\u4e00\u4e2a\u5f88\u957f\u7684 hashtable bucket\uff0c<\/p>\n
                                                                                          \u5982\u679c\u6709\u5927\u91cf http endpoints\uff0c\u90a3 key \u5f88\u53ef\u80fd\u5c31\u662f \u00a0443 \u548c 80\uff1b\u8fd9\u4f1a\u5bfc\u81f4 CPU \u6bdb\u523a\u751a\u81f3\u673a\u5668\u5361\u4f4f\u3002<\/p>\n<\/section>\n<\/li>\n<\/ol>\n
                                                                                          \u8fd9\u4e2a\u95ee\u9898\u82b1\u4e86\u5f88\u957f\u65f6\u95f4\u6392\u67e5\uff0c\u56e0\u6b64\u6709\u4eba\u5728\u7c7b\u578b\u573a\u666f\u4e0b\u9047\u5230\u7c7b\u4f3c\u95ee\u9898\uff0c\u5f88\u53ef\u80fd\u8ddf\u8fd9\u4e2a\u6709\u5173\u3002\u76f8\u5173\u5185\u6838\u4ee3\u7801<\/span>[7]<\/sup>\uff0c \u4fee\u590d\u89c1 patch<\/span>[8]<\/sup>\u3002<\/p>\n
                                                                                          3.3.6 bpf_sk_select_reuseport<\/code> vs bpf_sk_lookup<\/code><\/h4>\n
                                                                                          Cloudflare \u5f15\u5165\u4e86 `bpf_sk_lookup`<\/span>[9]<\/sup>\uff0c<\/p>\n
                                                                                          This\u00a0series\u00a0proposes\u00a0a\u00a0new\u00a0BPF\u00a0program\u00a0type<\/span>\u00a0named\u00a0BPF_PROG_TYPE_SK_LOOKUP,\r\nor\u00a0BPF\u00a0sk_lookup\u00a0for<\/span>\u00a0short.<\/code><\/pre>\n
                                                                                          BPF\u00a0sk_lookup\u00a0program\u00a0runs\u00a0when\u00a0transport\u00a0layer\u00a0is\u00a0looking\u00a0up\u00a0a\u00a0listening
                                                                                          \nsocket\u00a0for<\/span>\u00a0a\u00a0new\u00a0connection\u00a0request\u00a0(TCP),\u00a0or\u00a0when\u00a0looking\u00a0up\u00a0an
                                                                                          \nunconnected\u00a0socket\u00a0for<\/span>\u00a0a\u00a0packet\u00a0(UDP).<\/p>\n
                                                                                          <\/code><\/pre>\n
                                                                                          This\u00a0serves\u00a0as\u00a0a\u00a0mechanism\u00a0to\u00a0overcome\u00a0the\u00a0limits\u00a0of\u00a0what\u00a0bind<\/span>()\u00a0API\u00a0allows
                                                                                          \nto\u00a0express.\u00a0Two\u00a0use-cases\u00a0driving\u00a0this\u00a0work\u00a0are:<\/p>\n
                                                                                          <\/code><\/pre>\n
                                                                                          (1)\u00a0steer\u00a0packets\u00a0destined\u00a0to\u00a0an\u00a0IP\u00a0range,\u00a0fixed\u00a0port\u00a0to\u00a0a\u00a0single\u00a0socket<\/p>\n
                                                                                          <\/code><\/pre>\n
                                                                                          192.0.2.0\/24,\u00a0port\u00a080\u00a0->\u00a0NGINX\u00a0socket<\/p>\n
                                                                                          <\/code><\/pre>\n
                                                                                          (2)\u00a0steer\u00a0packets\u00a0destined\u00a0to\u00a0an\u00a0IP\u00a0address,\u00a0any\u00a0port\u00a0to\u00a0a\u00a0single\u00a0socket<\/p>\n
                                                                                          <\/code><\/pre>\n
                                                                                          198.51.100.1,\u00a0any\u00a0port\u00a0->\u00a0L7\u00a0proxy\u00a0socket<\/p>\n
                                                                                          <\/code><\/pre>\n
                                                                                          \n
                                                                                          \u66f4\u591a\u4fe1\u606f\uff0c\u53ef\u53c2\u8003\u4ed6\u4eec\u7684\u8bba\u6587\uff1a<\/p>\n
                                                                                          The ties that un-bind: decoupling IP from web services and sockets for robust addressing agility at CDN-scale, SIGCOMM 2021<\/p>\n<\/blockquote>\n
                                                                                          \u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u4e5f\u5141\u8bb8\u591a\u4e2a socket bind \u5230\u540c\u4e00\u4e2a port\uff0c\u56e0\u6b64\u4e0e bpf_sk_select_reuseport<\/code>\u529f\u80fd\u6709\u4e9b\u91cd\u53e0\uff0c\u56e0\u4e3a\u4e8c\u8005\u90fd\u6e90\u4e8e\u8fd9\u6837\u4e00\u79cd\u9650\u5236\uff1a\u5728\u6536\u5305\u65f6\uff0c\u7f3a\u5c11\u4ece\u5e94\u7528\u5c42\u76f4\u63a5\u547d\u4ee4\u5185\u6838\u9009\u62e9\u54ea\u4e2a socket \u7684\u63a7\u5236\u80fd\u529b\u3002<\/p>\n
                                                                                          \u4f46\u4e8c\u8005\u4e5f\u662f\u6709\u533a\u522b\u7684\uff1a<\/p>\n
                                                                                            \n
                                                                                          • \n
                                                                                            sk_select_reuseport<\/code> \u4e0e IP \u5730\u5740\u6240\u5c5e\u7684 socket family \u662f\u7d27\u8026\u5408\u7684<\/section>\n<\/li>\n
                                                                                          • \n
                                                                                            sk_lookup<\/code> \u5219\u5c06 IP \u4e0e socket \u89e3\u8026 \u2014\u2014 lets it pick any \/ netns<\/section>\n<\/li>\n<\/ul>\n
                                                                                            3.3.7 \u5c0f\u7ed3<\/h4>\n
                                                                                            \u672c\u8282\u4ecb\u7ecd\u4e86\u6211\u4eec\u7684\u57fa\u4e8e BPF_PROG_TYPE_SK_REUSEPORT \u548c BPF_MAP_TYPE_REUSEPORT_SOCKARRAY \u5b9e\u73b0\u7684\u65b0\u4e00\u4ee3\u53d1\u5e03\u6280\u672f\uff0c\u5b83\u80fd\u5b9e\u73b0\u4e3b\u673a\u5185\u65b0\u8001\u5b9e\u4f8b\u6d41\u91cf\u7684\u65e0\u635f\u5207\u6362\uff0c\u4f18\u70b9\uff1a<\/p>\n
                                                                                              \n
                                                                                            1. \n
                                                                                              \u7b80\u5316\u4e86\u8fd0\u7ef4\u6d41\u7a0b\uff0c\u53bb\u6389\u8106\u5f31\u548c\u590d\u6742\u7684\u8fdb\u7a0b\u95f4\u901a\u4fe1\uff08IPC\uff09\uff0c\u51cf\u5c11\u4e86\u6545\u969c\uff1b<\/section>\n<\/li>\n
                                                                                            2. \n
                                                                                              \u6548\u7387\u5927\u5e45\u63d0\u5347\uff0c\u4f8b\u5982 UDP \u6027\u80fd 10x\uff1b<\/section>\n<\/li>\n
                                                                                            3. \n
                                                                                              \u53ef\u9760\u6027\u63d0\u5347\uff0c\u4f8b\u5982\u907f\u514d\u4e86 UDP misrouting \u95ee\u9898\u548c TCP \u4e09\u6b21\u63e1\u624b\u65f6\u7684\u7ade\u4e89\u95ee\u9898\u3002<\/section>\n<\/li>\n<\/ol>\n<\/section>\n<\/section>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
                                                                                              \u8bd1\u8005\u5e8f \u672c\u6587\u7ffb\u8bd1\u81ea Facebook \u5728 LPC 2021 \u5927\u4f1a\u4e0a\u7684\u4e00\u7bc7\u5206\u4eab\uff1aFrom XDP to Sock […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4787","post","type-post","status-publish","format-standard","hentry","category-cisco"],"_links":{"self":[{"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts\/4787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4787"}],"version-history":[{"count":3,"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts\/4787\/revisions"}],"predecessor-version":[{"id":4851,"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts\/4787\/revisions\/4851"}],"wp:attachment":[{"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4787"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4787"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}