{"id":2518,"date":"2021-10-14T15:49:57","date_gmt":"2021-10-14T22:49:57","guid":{"rendered":"https:\/\/www.xh86.me\/?p=2518"},"modified":"2021-10-14T15:49:57","modified_gmt":"2021-10-14T22:49:57","slug":"kvm%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e4%b9%8b%e5%86%85%e5%ad%98%e7%af%87","status":"publish","type":"post","link":"https:\/\/www.xh86.me\/?p=2518","title":{"rendered":"KVM\u6027\u80fd\u4f18\u5316\u4e4b\u5185\u5b58\u7bc7"},"content":{"rendered":"<div>\n<h1>kvm\u5185\u5b58\u4f18\u5316\uff1a<\/h1>\n<h2>EPT \u6280\u672f<\/h2>\n<p>\u200b \u5728\u865a\u62df\u5316\u73af\u5883\u4e0b\uff0cintel\u5f00\u521b\u7684\u786c\u4ef6\u8f85\u52a9\u5185\u5b58\u865a\u62df\u5316\u6280\u672f\u3002\u5373\u6269\u5c55\u9875\u8868EPT\uff0c\u800cAMD\u4e5f\u6709\u7c7b\u4f3c\u7684\u6210\u4e3aNPT\u3002\u5728\u6b64\u4e4b\u524d\uff0c\u5185\u5b58\u865a\u62df\u5316\u4f7f\u7528\u7684\u4e00\u4e2a\u91cd\u8981\u6280\u672f\u4e3a\u5f71\u5b50\u9875\u8868\u3002\uff08\u5f71\u5b50\u9875\u8868\u91c7\u7528\u7684\u662f\u4e00\u6b65\u5230\u4f4d\u5f0f\uff0c\u5373\u5b8c\u6210\u5ba2\u6237\u673a\u865a\u62df\u5730\u5740GVA\u5230\u5bbf\u4e3b\u673a\u7269\u7406\u5730\u5740HPA\u7684\u8f6c\u6362\uff0c\u7531VMM\u4e3a\u6bcf\u4e2a\u5ba2\u6237\u673a\u8fdb\u7a0b\u7ef4\u62a4\u3002\uff09<\/p>\n<p>\u200b \u5728\u865a\u62df\u5316\u73af\u5883\u4e0b\uff0c\u6b63\u5e38\u8bbf\u95ee\u5185\u5b58\u6d41\u7a0b\uff1aGVA&#8211;&gt;GPA&#8211;&gt;HPA\u3002<\/p>\n<p>\u200b \u6709\u4e86EPT\u6280\u672f\uff0c\u90a3\u4e48\u80fd\u591f\u5c06\u865a\u62df\u673a\u7684\u7269\u7406\u5730\u5740\u76f4\u63a5\u7ffb\u8bd1\u4e3a\u5bbf\u4e3b\u673a\u7684\u7269\u7406\u5730\u5740\uff0c\u4ece\u800c\u628a\u540e\u9762\u90a3\u4e2a\u8f6c\u6362\u8fc7\u7a0b\u53bb\u6389\u4e86\uff0c\u589e\u52a0\u4e86\u6548\u7387\u3002<\/p>\n<p>\u90a3\u4e48\u8fd9\u9879\u6280\u672f\uff0c\u73b0\u5728\u7684\u670d\u52a1\u5668\u90fd\u652f\u6301\uff0c\u53ea\u8981\u5728BIOS\u6253\u5f00\u4e86intel \u7684VT\u8bbe\u7f6e\uff0c\u90a3\u4e48\u8fd9\u4e2a\u4e5f\u4e00\u8d77\u6253\u5f00\u4e86\u3002<\/p>\n<h2>\u5927\u9875\u548c\u900f\u660e\u5927\u9875<\/h2>\n<p>\u5927\u9875\uff1a\u6307\u7684\u662f\u5185\u5b58\u7684\u5927\u9875\u9762\u3002<\/p>\n<p>\u5c0f\u9875\u9762\uff1a\u5f53\u521d\u8fd9\u4e2a\u673a\u5236\u63d0\u51fa\u7684\u65f6\u5019\uff0c\u8ba1\u7b97\u673a\u7684\u5185\u5b58\u5927\u5c0f\u4e5f\u5c31\u51e0\u5341M\uff0c\u6240\u4ee5\u5f53\u65f6\u5185\u5b58\u9ed8\u8ba4\u7684\u9875\u9762\u5927\u5c0f\u90fd\u662f4KB\uff0c\u90a3\u4e48\u8fd9\u4e2a4KB \u4e5f\u5c31\u662f\u6240\u8c13\u7684\u5c0f\u9875\u9762\u3002\u968f\u7740\u8ba1\u7b97\u673a\u7684\u786c\u4ef6\u53d1\u5c55\uff0c\u5185\u5b58\u57fa\u672c\u90fd\u662f\u5927\u5bb9\u91cf\u7684\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5982\u679c\u8fd8\u662f\u5c0f\u9875\u5b58\u5728\uff0c\u90a3\u4e48\u5c06\u4f1a\u4ea7\u751f\u8f83\u591a\u7684TLB Miss\u548c\u7f3a\u9875\u4e2d\u65ad\uff0c\u4ece\u800c\u5927\u5927\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n<p>\u200b \u4e3a\u4ec0\u4e48\u5c0f\u9875\u5c31\u5b58\u5728\u8f83\u591a\u7684Miss\u548c\u7f3a\u9875\u4e2d\u65ad\u5462\uff1f\u6bd4\u5982\u8bf4\u7cfb\u7edf\u91cc\u7684\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u9700\u89812MB\u7684\u5185\u5bb9\uff0c\u5982\u679c\u64cd\u4f5c\u7cfb\u7edf\u8fd8\u662f\u4ee54KB\u5c0f\u9875\u4e3a\u5355\u4f4d\uff0c\u90a3\u4e48\u5185\u5b58\u91cc\u5c31\u8981\u6709512\u4e2a\u9875\u9762\uff08512*4KB=2M\uff09\uff0c\u6240\u4ee5\u5728TLB\u91cc\u5c31\u9700\u8981512\u4e2a\u8868\u9879\u4ee5\u53ca512\u4e2a\u9875\u8868\u9879\uff0c\u56e0\u6b64\u64cd\u4f5c\u7cfb\u7edf\u5c31\u8981\u7ecf\u5386512\u6b21\u7684TLB miss\u548c512\u6b21\u7684\u7f3a\u9875\u4e2d\u65ad\u624d\u80fd\u5c062MB\u7684\u5e94\u7528\u7a0b\u5e8f\u7a7a\u95f4\u5168\u90e8\u6620\u5c04\u5230\u7269\u7406\u5185\u5b58\u91cc\u3002\u60f3\u60f3\uff0c2MB\u5185\u5b58\u7684\u9700\u8981\u5c31\u8981\u7ecf\u5386512\u6b21\u7684\u64cd\u4f5c\uff0c\u5982\u679c\u5185\u5b58\u9700\u6c42\u5927\u5462\uff1f\u5fc5\u7136\u64cd\u4f5c\u6570\u91cf\u4f1a\u5927\u5927\u589e\u52a0\uff0c\u4ece\u800c\u95f4\u63a5\u7684\u5f71\u54cd\u6027\u80fd\u3002\uff08Translation Lookaside Buffer\u7684\u7f29\u5199\uff0c\u865a\u62df\u5bfb\u5740\u7684\u7f13\u5b58\uff0c\u7528\u4e8e\u865a\u62df\u5730\u5740\u4e0e\u5b9e\u5730\u5740\u4e4b\u95f4\u7684\u4ea4\u4e92\uff0c\u63d0\u4f9b\u4e00\u4e2a\u5bfb\u627e\u5b9e\u5730\u5740\u7684\u7f13\u5b58\u533a\uff0c\u80fd\u591f\u6709\u6548\u51cf\u5c11\u5bfb\u627e\u7269\u7406\u5730\u5740\u6240\u6d88\u8017\u65f6\u95f4\u3002\uff09<\/p>\n<p>\u200b \u5982\u679c\u628a\u8fd9\u4e2a4KB\u53d8\u62102MB\u5462\uff1f\u90a3\u5c31\u5f88\u8f7b\u677e\u4e86\uff0c\u4e00\u6b21TLB Miss\u548c\u7f3a\u9875\u4e2d\u65ad\u64cd\u4f5c\u5c31\u5b8c\u6210\u4e86\uff0c\u5927\u5927\u7684\u589e\u52a0\u4e86\u6548\u7387\u3002<\/p>\n<p>\u200b \u6240\u4ee5\uff0c\u865a\u62df\u673a\u53ef\u4ee5\u901a\u8fc7\u5206\u914d\u5de8\u578b\u9875\u4e5f\u5c31\u662f\u521a\u624d\u8bf4\u7684\u5927\u9875\u6765\u63d0\u9ad8\u8fd0\u884c\u6027\u80fd\u3002<\/p>\n<p>\u5177\u4f53\u600e\u4e48\u64cd\u4f5c\u5462\uff1f<\/p>\n<p>\u5982\u4f55\u628a\u8fd9\u4e2a4KB\u7684\u5c0f\u9875\u53d8\u62102MB\u751a\u81f31GB\u7684\u5927\u9875\uff0c\u7136\u540e\u628a\u8fd9\u4e2a\u5927\u9875\u8d4b\u7ed9\u865a\u62df\u673a\u4f7f\u7528\uff1f<\/p>\n<p>\u901a\u8fc7\u547d\u4ee4 cat \/proc\/meminfo | grep HugePages \u67e5\u770b\u5f53\u524d\u7cfb\u7edf\u6709\u591a\u5c11\u4e2a\u5927\u9875\u3002<\/p>\n<p>\u8fd0\u884c echo 2000 &gt; \/proc\/sys\/vm\/nr_hugepages<\/p>\n<p>\u6c38\u4e45\u751f\u6548 \uff1asysctl -w vm.nr_hugepages=2000<\/p>\n<p>\u628a\u5927\u9875\u8fdb\u884c\u6302\u8f7d\uff1a<\/p>\n<p>mount -t hugetlbfs hugetlbfs \/dev\/hugepages<\/p>\n<p>\u8fd9\u4e2ahugetlbfs \u662f\u4e00\u79cd\u7279\u6b8a\u6587\u4ef6\u7cfb\u7edf\uff0c\u90a3\u81f3\u4e8e\u4e3a\u4ec0\u4e48\u91c7\u7528\u8fd9\u6837\u7684\u6587\u4ef6\u7cfb\u7edf\u662f\u56e0\u4e3a\u8fd9\u6837\u82b1\u8d39\u7684\u4ee3\u4ef7\u5c0f\u3002<\/p>\n<p>\u90a3\u4e48\u901a\u8fc7\u8fd9\u51e0\u6b65\u64cd\u4f5c\uff0c\u5f00\u542f-&gt;\u8bbe\u7f6e\u5927\u9875\u6570\u91cf-&gt;\u6302\u8f7d\uff0c \u90a3\u4e48\u5bbf\u4e3b\u673a\u8fd9\u5757\u5c31\u6ca1\u4ec0\u4e48\u95ee\u9898\u4e86\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eecKVM\u91cc\u9762\u7684\u67d0\u4e2a\u865a\u62df\u673a\u8981\u4f7f\u7528\u5bbf\u4e3b\u673a\u7684\u5927\u9875\uff0c\u90a3\u4e48\u6211\u4eec\u8fd8\u5f97\u505a\u5982\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<ol>\n<li>\u91cd\u542f\u4e0blibvirtd\u670d\u52a1\uff1b<\/li>\n<li>\u865a\u62df\u673a\u4e5f\u5f00\u542f\u900f\u660e\u5de8\u578b\u9875\uff1b<\/li>\n<li>\u5173\u95ed\u865a\u62df\u673a\u7f16\u8f91\u865a\u62df\u673aXML\u8bbe\u7f6e\u865a\u62df\u673a\u53ef\u4ee5\u4f7f\u7528\u5bbf\u4e3b\u673a\u7684\u5de8\u578b\u9875\u6570\u91cf<\/li>\n<\/ol>\n<p>libvirtd\u670d\u52a1\u91cd\u542f\uff1asystemctl restart libvirtd.service\uff1b<\/p>\n<p>\u7f16\u8f91\u865a\u62df\u673aXML\u6587\u4ef6\uff0c\u8ba9\u5b83\u4f7f\u7528\u5bbf\u4e3b\u673a\u7684\u5927\u9875\uff0c\u4f7f\u7528virsh edit vmname \u547d\u4ee4\u4fee\u6539\uff1b<\/p>\n<p>\u5728\u5bbf\u4e3b\u673a\u8fd0\u884c cat \/proc\/meminfo | grep -i HugePages \u67e5\u770b\u4e0b\u5927\u9875\u7684\u4f7f\u7528\u60c5\u51b5\uff1b<\/p>\n<p>\u200b \u6ce8\u610f\u8fd9\u4e2a\u865a\u62df\u673a\u7684\u5185\u5b58\u662f2G\u7684\u914d\u7f6e\uff0c\u53d1\u73b0hugepages_free\u5df2\u7ecf\u53d8\u6210\u4e86912\u4e2a\u4e86\uff0c\u90a3\u4e48\u4f7f\u7528\u4e862000-912=1088 \u4e2a\uff1b\u90a3\u4e482*1088=2176M \u6b63\u597d\u8ddf\u865a\u62df\u673a\u5185\u5b58\u7684\u5927\u5c0f2G\u5dee\u4e0d\u591a\u3002<\/p>\n<p>\u90a3\u4e48\u8981\u8ba9\u5927\u9875\u540c\u65f6\u8ba9\u591a\u4e2a\u865a\u62df\u673a\u4eab\u7528\uff0c\u6709\u4ee5\u4e0b\u4e24\u6b65\u8981\u505a\uff1a<\/p>\n<ol>\n<li>\u7ed9NUMA \u5404\u4e2anode\u8282\u70b9\u5206\u914d\u591a\u4e2a2MB\u6216\u80051GB\u7684\u5927\u9875\uff1b<\/li>\n<li>\u7f16\u8f91\u865a\u62df\u673axml\u6587\u4ef6\u4ee5\u4f7f\u7528node\u91cc\u5206\u914d\u597d\u7684\u5927\u9875\u3002\n<p>\u7ed9\u5bbf\u4e3b\u673a\u5404\u4e2aNUMA Node\u5206\u914d\u5927\u9875\uff1a<\/li>\n<\/ol>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>   #echo 4 &gt; \/sys\/devices\/system\/node\/node0\/hugepages\/hugepages-1048576kB\/nr_hugepages\r\n   #echo 1024 &gt; \/sys\/devices\/system\/node\/node1\/hugepages\/hugepages-2048kB\/nr_hugepages\r\n<\/pre>\n<\/div>\n<p>\u8fd9\u4e24\u4e2a\u547d\u4ee4\u7684\u610f\u601d\u5c31\u662f\u5148\u7ed9node0\u91cc\u5206\u914d4\u4e2a1GB\u7684\u5927\u9875\uff0c\u7136\u540e\u518d\u7ed9node1\u5206\u914d1024\u4e2a2MB\u7684\u5927\u9875\u3002<\/p>\n<p>\u7136\u540e\u6267\u884c\u76f8\u5173\u6302\u8f7d\u64cd\u4f5c\uff0c\u8fd9\u8ddf\u521a\u624d\u6211\u4eec\u505a\u7684\u64cd\u4f5c\u7c7b\u4f3c\uff1a<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre># mkdir \/dev\/hugepages1G\r\n\r\n# mount -t hugetlbfs -o pagesize=1G none \/dev\/hugepages1G\r\n\r\n# mkdir \/dev\/hugepages2M\r\n\r\n# mount -t hugetlbfs -o pagesize=2M none \/dev\/hugepages2M\r\n<\/pre>\n<\/div>\n<p>\u6302\u8f7d\u6210\u529f\u540e\uff0c\u91cd\u542f\u4e0blibvirtd\u670d\u52a1\uff0c\u7136\u540e\u865a\u62df\u673a\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e86\uff0c\u4f46\u662f\u8fd9\u91cc\u8981\u6ce8\u610f\u7684\u662f\uff0c1GB\u7684\u5927\u9875\uff0c\u865a\u62df\u673a\u662f\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u7684\uff0c\u9700\u8981\u5728XML\u91cc\u6307\u5b9a\u3002<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>\u90a3\u4e48\u600e\u4e48\u6307\u5b9a? \u6211\u4eec\u76ee\u524d\u5bbf\u4e3b\u673aNUMA node1\u548cnode2\u91cc\u9762\u5206\u522b\u67094\u4e2a1GB\u7684\u548c1024\u4e2a2MB\u7684\u5927\u9875\u3002\u56e0\u6b64\uff0c\u53ea\u8981\u8dd1\u5728\u8fd9\u4e24node\u4e0a\u7684\u865a\u62df\u673a\u90fd\u53ef\u4ee5\u4eab\u7528\u4e86\u3002\r\n\r\n  \u6bd4\u5982\u521a\u624d\u6211\u4eec\u90a3\u865a\u62df\u673a\uff0c\u6211\u4eec\u8981\u8ba9\u5b83\u4f7f\u75281GB\u7684\u5927\u9875\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728XML\u91cc\u8fd9\u6837\u5b9a\u4e49\r\n\r\n&lt;memoryBacking&gt;\r\n\r\n      &lt;hugepages\/&gt;\r\n\r\n          &lt;page size=\"1\" unit=\"G\" nodeset=\"0-3,5\"\/&gt;\r\n\r\n          &lt;page size=\"2\" unit=\"M\" nodeset=\"4\"\/&gt;\r\n\r\n      &lt;\/hugepages&gt;\r\n\r\n&lt;\/memoryBacking&gt;\r\n\r\n   \u7ea2\u8272\u7684\u90e8\u5206\u5c31\u662f\u8981\u6dfb\u52a0\u7684\u53c2\u6570\uff0csize\u662f1\uff0c\u8868\u793a\u7b2c\u4e00\u4e2a\u4f7f\u7528\u7684page\uff1b\u7136\u540e\u5355\u4f4dunit\u662fG\uff0cnodeset=\"0-3,5\" \u610f\u601d\u662f\u865a\u62df\u673a\u7684NUMA node0\uff0cnode1, node2 , node3\u548cnode5\u5c06\u4f7f\u75281GB\u7684\u5927\u9875 \uff1b \u865a\u62df\u673a\u7684node4\u5c06\u75282MB\u7684\u5927\u9875\u3002\r\n<\/pre>\n<\/div>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>  \u6ce8\u610f\uff0c\u8fd9\u91cc\u7684nodeset\u6307\u7684\u662f\u865a\u62df\u673a\u7684\u8282\u70b9\uff0c\u540c\u65f6\u8fd8\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u5bbf\u4e3b\u673a\u5927\u9875\u9762\u4e0d\u591f\u7528\u4e86\uff0c\u4f60\u8fd9\u6837\u914d\u7f6e\u4e86\uff0c\u865a\u62df\u673a\u662f\u4f1a\u8d77\u4e0d\u6765\u7684\u3002\r\n<\/pre>\n<\/div>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>  \u4ee5\u4e0a\u5c31\u662f\u7ed9\u865a\u62df\u673a\u5206\u914d\u5927\u9875\u7684\u65b9\u6cd5\u3002\u5f53\u7136\u5982\u679c\u4f60\u60f3\u628a\u5bbf\u4e3b\u673a\u7684\u5927\u9875\u5173\u95ed\uff0c\u53ea\u8981\u6267\u884c\uff1a\r\n\r\n  # sysctl vm.nr_hugepages=0\r\n\r\n  # umount hugetlbfs\r\n<\/pre>\n<\/div>\n<p>\u900f\u660e\u5927\u9875\uff1a<\/p>\n<p>\u200b \u4eceCentos6\u5f00\u59cb\uff0clinux\u7cfb\u7edf\u81ea\u5e26\u4e86\u4e00\u6280\u672f\u53eb\u900f\u660e\u5de8\u578b\u9875\uff08transparent huge page\uff09\uff0c\u5b83\u5141\u8bb8\u6240\u6709\u7684\u7a7a\u4f59\u5185\u5b58\u88ab\u7528\u4f5c\u7f13\u5b58\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u800c\u4e14\u8fd9\u4e2a\u8bbe\u7f6e\u662f\u9ed8\u8ba4\u5f00\u542f\u7684\u3002<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>cat \/sys\/kernel\/mm\/transparent_hugepage\/enabled \u53ef\u4ee5\u67e5\u770b\u3002\r\n<\/pre>\n<\/div>\n<p>\u6211\u4eec\u770b\u5230\u8fd9\u4e2a\u4e2d\u62ec\u53f7\u628a\u8fd9\u4e2aalways\u62ec\u8d77\u6765\u4e86\uff0c\u8bf4\u660e\u8fd9\u673a\u5668\u7684\u900f\u660e\u5de8\u578b\u9875\u7684\u529f\u80fd\u662f\u6253\u5f00\u7684\u3002\u5f53\u6709512\u4e2a\u9875\u9762\u53ef\u4ee5\u6574\u5408\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u5408\u6210\u4e00\u4e2a2MB\u7684\u5927\u9875\uff1b<\/p>\n<p>\u5982\u679c\u662f\u5728\u62ec\u53f7\u628anever\u62ec\u8d77\u6765\u4e86\uff0c\u90a3\u4e48\u5c31\u662f\u5173\u95ed\u72b6\u6001\uff1b<\/p>\n<p>madvise\u7684\u8bdd\u5c31\u662f\u907f\u514d\u6539\u53d8\u5185\u5b58\u5360\u7528\u3002<\/p>\n<p>\u4e0b\u9762\u547d\u4ee4\u662f\u5173\u95ed\u5de8\u578b\u9875\uff1a<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre> echo never &gt;\/sys\/kernel\/mm\/transparent_hugepage\/enabled\r\n<\/pre>\n<\/div>\n<p>\u6700\u540e\u8981\u6ce8\u610f\u7684\u662f\u900f\u660e\u5de8\u578b\u9875\u8ddf\u521a\u624d\u6211\u4eec\u8bf4\u7684hugetlbfs \u6587\u4ef6\u6302\u8f7d\u5927\u9875\u662f\u4e0d\u51b2\u7a81\u7684\uff0c\u5982\u679c\u4f60\u6ca1\u505a\u4efb\u4f55\u5927\u9875\u7684\u6307\u5b9a\u548c\u6302\u8f7d\uff0c\u90a3\u4e48KVM\u5c31\u4f1a\u4f7f\u7528\u900f\u660e\u5927\u9875\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u90a3\u4e48\u8bf4\u5230\u8fd9\uff0c\u5927\u5bb6\u5c31\u4f1a\u7591\u95ee\uff0c\u65e2\u7136\u6709\u900f\u660e\u5927\u9875\uff0c\u6211\u4e3a\u4f55\u8fd8\u8981\u8d39\u52b2\u7684\u53bb\u505a\u76f8\u5173\u5927\u9875\u7684\u6307\u5b9a\uff1f \u5176\u5b9e\u8fd9\u4e24\u79cd\u65b9\u5f0f\u90fd\u5dee\u4e0d\u591a\uff0c\u533a\u522b\u5c31\u662f\u4e00\u4e2a\u662f\u624b\u52a8\u7684\u4e00\uff0c\u4e2a\u662f\u81ea\u52a8\u7684\u3002\u5982\u679c\u4f60\u5bf9\u4f60\u5bbf\u4e3b\u673a\u8d44\u6e90\u628a\u63e1\u7684\u66f4\u52a0\u7cbe\u51c6\uff0c\u63a8\u8350\u7684\u8fd8\u662f\u624b\u52a8\u6307\u5b9a\u3002<\/p>\n<h2>KSM \u6280\u672f<\/h2>\n<p>\u200b KSM\uff08Kernel SamePage Merging\uff09\uff0c\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u76f8\u540c\u9875\u9762\u5185\u5b58\u538b\u7f29\u6280\u672f\u3002<\/p>\n<p>KSM\u670d\u52a1\u5728linux\u7cfb\u7edf\u91cc\u9ed8\u8ba4\u662f\u5f00\u542f\u7684\uff0c\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u8ba9\u5185\u5b58\u5229\u7528\u7684\u66f4\u52a0\u9ad8\u6548\uff0c\u5982\u679c\u591a\u4e2a\u7a0b\u5e8f\u4e2d\u7528\u7684\u5185\u5b58\u90fd\u662f\u76f8\u540c\u7684\u9875\u9762\uff0c\u90a3\u4e48KSM\u5c31\u4f1a\u628a\u76f8\u540c\u7684\u5185\u5b58\u5408\u5e76\uff0c\u8fd9\u6837\u5c31\u80fd\u817e\u51fa\u66f4\u591a\u7684\u7a7a\u95f4\u3002<\/p>\n<p>KSM\u5728\u7cfb\u7edf\u91cc\u6709\u4e2a\u5b88\u62a4\u8fdb\u7a0b\uff0c\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u4e0d\u65ad\u7684\u626b\u63cf\u5bbf\u4e3b\u673a\u7684\u5185\u5b58\u60c5\u51b5\uff0c\u68c0\u6d4b\u6709\u76f8\u540c\u7684\u9875\u9762\u5c31\u4f1a\u5408\u5e76\uff0c\u5f53\u7136\u8fd9\u6216\u591a\u6216\u5c11\u4f1a\u6d88\u8017\u70b9CPU\u3002<\/p>\n<p>\u200b \u5982\u679c\u4f60\u7684\u73af\u5883\uff0c\u5185\u5b58\u8d44\u6e90\u6bd4\u8f83\u4e30\u5bcc\uff0c\u5efa\u8bae\u8fd9\u4e2a\u529f\u80fd\u5f00\u4e0d\u5f00\u542f\u90fd\u65e0\u6240\u8c13\uff1b\u5982\u679c\u4e0d\u591f\uff0c\u53c8\u60f3\u8dd1\u591a\u4e00\u70b9\u7684\u865a\u62df\u673a\uff0c\u90a3\u4e48\u53ef\u4ee5\u6253\u5f00\u8fd9\u4e2a\u529f\u80fd\uff0c\u4f46\u662f\u4f60\u4e00\u5b9a\u8981\u6e05\u695a\uff0c\u8fd9\u4e2a\u662f\u4e00\u79cd\u5185\u5b58\u8d85\u7528\u7684\u65b9\u6848\uff0c\u5047\u5982\u4f60\u7684\u5927\u90e8\u5206\u865a\u62df\u673a\u5185\u5b58\u53d8\u5316\u6bd4\u8f83\u9891\u7e41\uff08\u6bd4\u5982\u5185\u5b58\u4f7f\u7528\u7387\u4e00\u4e0b\u9ad8\uff0c\u4e00\u4e0b\u4f4e\uff09\uff0c\u90a3\u4e48\u4e0d\u5efa\u8bae\u5f00\u542f\uff0c\u56e0\u4e3a\u5185\u5b58\u4e0d\u591f\u4e86\uff0c\u5c31\u4f1a\u7528\u5230swap\uff0c\u90a3\u4e48\u8fd9\u4e2a\u4f1a\u4e25\u91cd\u5f71\u54cd\u865a\u62df\u673a\u6027\u80fd\u3002<\/p>\n<p>\u9996\u5148\u662f\u5f00\u5173KSM\u670d\u52a1<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre> systemctl start|stop ksmd\r\n\r\n systemctl start|stop ksmtuned \r\n\r\n systemctl enable|disable ksmd\r\n\r\n systemctl enable|disable ksmtuned\r\n<\/pre>\n<\/div>\n<p>\u5176\u6b21\u662f\u5728\u5bbf\u4e3b\u673aKSM\u670d\u52a1\u6253\u5f00\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u4e0d\u60f3\u8ba9\u865a\u62df\u673a\u53d7\u5bbf\u4e3b\u673aKSM\u7684\u5f71\u54cd\uff0c\u90a3\u4e48\u53ef\u4ee5\u8fd9\u4e48\u64cd\u4f5c\uff1a<br \/>\n\u7f16\u8f91\u865a\u62df\u673a\u7684XML\u6587\u4ef6\uff0c\u6dfb\u52a0\uff1a<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>&lt;memoryBacking&gt;\r\n\r\n    &lt;nosharepages\/&gt;\r\n\r\n &lt;\/memoryBacking&gt;\r\n<\/pre>\n<\/div>\n<p>\u8fd9\u6837\uff0c\u8fd9\u4e2aKSM\u5c31\u4e0d\u4f1a\u53bb\u5408\u5e76\u8fd9\u4e2a\u865a\u62df\u673a\u7684\u5185\u5b58\u4e86<\/p>\n<p>\u603b\u7684\u6765\u8bf4\uff0c\u7528\u4e0d\u7528KSM\u89c6\u4f60\u81ea\u5df1\u7684\u751f\u4ea7\u73af\u5883\u5177\u4f53\u60c5\u51b5\u800c\u5b9a\u3002<\/p>\n<h2>\u5185\u5b58\u9650\u5236\u6280\u672f<\/h2>\n<p>\u901a\u8fc7\u865a\u62df\u673a\u5185\u5b58\u9650\u5236\uff0c\u53ef\u4ee5\u8ba9\u865a\u62df\u673a\u7684\u5185\u5b58\u4f7f\u7528\u9650\u5236\u5728\u4e00\u5b9a\u8303\u56f4\u5185\u3002<\/p>\n<p>\u200b \u6bd4\u5982\u4f60\u7684\u4e00\u53f0KVM\u5bbf\u4e3b\u673a\uff0c\u91cc\u9762\u8dd1\u7740\u591a\u4e2a\u4e1a\u52a1\u7684\u865a\u62df\u673a\uff0c\u6709\u7684\u865a\u62df\u673a\u4e1a\u52a1\u6bd4\u8f83\u5927\uff0c\u5403\u5f97\u5185\u5b58\u591a\uff0c\u6709\u7684\u4e1a\u52a1\u6bd4\u8f83\u4f4e\uff0c\u7528\u4e0d\u4e86\u591a\u5c11\u5185\u5b58\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5185\u5b58\u9650\u5236\u6280\u672f\u6765\u624b\u52a8\u8c03\u8282\u5bbf\u4e3b\u673a\u7684\u5185\u5b58\u5206\u914d\u3002<\/p>\n<p>\u200b \u4f7f\u7528\u8fd9\u4e2a\u5fc5\u987b\u5bf9\u4f60\u865a\u62df\u5316\u73af\u5883\u7279\u522b\u6e05\u695a\uff0c\u6bd4\u5982\u5bbf\u4e3b\u673a\u5e73\u65f6\u7684\u8d1f\u8f7d\u60c5\u51b5\u4ee5\u53ca\u5404\u4e2a\u865a\u62df\u673a\u7684\u8d1f\u8f7d\u60c5\u51b5\u3002<\/p>\n<p>\u200b \u901a\u8fc7memtune\u547d\u4ee4\u6216\u8005\u901a\u8fc7\u6539\u865a\u62df\u673a\u7684XML\u6587\u4ef6\u6765\u8bbe\u5b9a\u5185\u5b58\u7684\u9650\u5236.<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre> hard_limit\uff1a\u5f3a\u5236\u8bbe\u7f6e\u865a\u62df\u673a\u6700\u5927\u4f7f\u7528\u5185\u5b58\uff0c\u5355\u4f4d\u4e3aKB\r\n \r\n soft_limit\uff1a\u53ef\u7528\u6700\u5927\u5185\u5b58\uff0c\u5355\u4f4d\u4e3aKB\r\n \r\n swap_hard_limit\uff1a\u865a\u62df\u673a\u6700\u591a\u4f7f\u7528\u7684\u5185\u5b58\u52a0\u4e0aswap\u7684\u5927\u5c0f\uff0c\u5355\u4f4d\u4e3aKB\r\n \r\n min_guarantee\uff1a\u5f3a\u5236\u8bbe\u7f6e\u865a\u62df\u673a\u6700\u4f4e\u4f7f\u7528\u7684\u5185\u5b58\uff0c\u5355\u4f4d\u4e3aKB\r\n<\/pre>\n<\/div>\n<p>\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u867d\u7136OPTIONS\u91cc\u6709\u5217\u51fa\uff0c\u4f46\u662f\u5b9e\u6d4b\u662f\u53d1\u73b0CentOS7.0 \u4ee5\u4e0a\u7cfb\u7edf\u4e0d\u80fd\u652f\u6301\uff0c\u6267\u884c\u7684\u65f6\u5019\u4f1a\u62a5\u4e0b\u9762\u8fd9\u6837\u7684\u9519\u8bef\uff1a \u200b<\/p>\n<p>\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539XML\u7684\u65b9\u5f0f\u6765\u73b0\u5728\u865a\u62df\u673a\u7684\u5185\u5b58\u3002<br \/>\n\u6211\u4eec\u5728XML\u91cc\u6dfb\u52a0\u4e0b\u9762\u8fd9\u4e2a\u914d\u7f6e\u5373\u53ef\uff1a<\/p>\n<div><button type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><\/button><\/p>\n<pre>  &lt;memtune&gt;\r\n \r\n       &lt;hard_limit unit='KiB'&gt;9437184&lt;\/hard_limit&gt;\r\n \r\n       &lt;soft_limit unit='KiB'&gt;8388608&lt;\/soft_limit&gt;\r\n \r\n       &lt;swap_hard_limit unit='KiB'&gt;10485760&lt;\/swap_hard_limit&gt;\r\n \r\n  &lt;\/memtune&gt;<\/pre>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>kvm\u5185\u5b58\u4f18\u5316\uff1a EPT \u6280\u672f \u200b \u5728\u865a\u62df\u5316\u73af\u5883\u4e0b\uff0cintel\u5f00\u521b\u7684\u786c\u4ef6\u8f85\u52a9\u5185\u5b58\u865a\u62df\u5316\u6280\u672f\u3002\u5373\u6269\u5c55\u9875\u8868EPT\uff0c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-2518","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts\/2518","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=2518"}],"version-history":[{"count":1,"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts\/2518\/revisions"}],"predecessor-version":[{"id":2519,"href":"https:\/\/www.xh86.me\/index.php?rest_route=\/wp\/v2\/posts\/2518\/revisions\/2519"}],"wp:attachment":[{"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xh86.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}