{"id":149,"date":"2017-04-01T15:08:30","date_gmt":"2017-04-01T07:08:30","guid":{"rendered":"https:\/\/blog.espnlol.com\/?p=149"},"modified":"2017-04-01T15:08:44","modified_gmt":"2017-04-01T07:08:44","slug":"ksm%e4%b8%8ekvm-cpu%e3%80%81%e5%86%85%e5%ad%98%e6%8e%a7%e5%88%b6ksmd%e5%8d%a0%e7%94%a8%e8%bf%87%e9%ab%98cpu","status":"publish","type":"post","link":"https:\/\/blog.espnlol.com\/?p=149","title":{"rendered":"KSM\u4e0eKVM CPU\u3001\u5185\u5b58\u63a7\u5236(KSMD\u5360\u7528\u8fc7\u9ad8CPU)"},"content":{"rendered":"

\u5929\u5728\u767b\u9646\u4e00\u53f0KVM\u7269\u7406\u673a\u65f6\uff0c\u53d1\u73b0\u8fdb\u7a0bksmd\u7adf\u7136\u5360\u752850%\u4ee5\u4e0a\u7684cpu\uff0c\u8f83\u4e4b\u5355\u4e2aqemu-kvm\u8fdb\u7a0b\u5360\u7528\u7684cpu\u8fd8\u5927 \u3002\u7531\u4e8e\u5bf9\u8be5\u8fdb\u7a0b\u505a\u4ec0\u4e48\u7528\u7684\u4e0d\u751a\u4e86\u89e3\u3002\u6240\u4ee5\u4e0d\u6562\u8d38\u7136\u5c06\u5176kill\u6389 \u3002\u5177\u4f53\u4ec0\u4e48\u662fKSM\u5462 \uff1f<\/p>\n

ksm\u662f\u57fa\u4e8e\u5185\u6838\u7684\u865a\u62df\u673a\uff08KVM\uff09\u88ab\u8bbe\u8ba1\u4e3a\u81ea\u8c03\u4f18\uff0c\u4f46\u662f\u53ef\u4ee5\u8c03\u6574\u4e00\u4e9b\u53c2\u6570\u4f7fKVM\u4e3b\u673a\u6027\u80fd\u66f4\u597d\u3002\u6700\u91cd\u8981\u7684\u53c2\u6570\u662f\u5185\u6838\u540c\u9875\u5408\u5e76\uff08kernel samepage merging ,KSM\uff09\uff0c\u8fd9\u4e00\u7279\u6027\u5141\u8bb8\u5185\u6838\u66f4\u6709\u6548\u5730\u5904\u7406\u5185\u5b58\u3002KSM\u5141\u8bb8Linux\u5185\u6838\u8bc6\u522b\u51fa\u5305\u542b\u76f8\u540c\u5185\u5bb9\u7684\u5185\u5b58\u9875\uff0c\u7136\u540e\u5408\u5e76\u8fd9\u4e9b\u5185\u5b58\u9875\uff0c\u5c06\u6570\u636e\u6574\u5408\u5728\u4e00\u4e2a\u4f4d\u7f6e\u53ef\u4ee5\u591a\u6b21\u5f15\u7528\u3002<\/p>\n

\u5982\u679c\u5728\u4e3b\u673a\u4e0a\u4f7f\u7528KVM\uff0c\u901a\u5e38\u4f1a\u6fc0\u6d3b\u6570\u4e2a\u5ba2\u6237\u64cd\u4f5c\u7cfb\u7edf\uff0c\u800c\u4e14\u8fd9\u4e9b\u64cd\u4f5c\u7cfb\u7edf\u7ecf\u5e38\u8fd0\u884c\u76f8\u540c\u7684OS\uff0c\u8fd9\u610f\u5473\u7740\u5927\u91cf\u7684\u5185\u6838\u9875\u9762\u88ab\u591a\u6b21\u52a0\u8f7d\u3002\u901a\u8fc7\u5e94\u7528KSM\uff0c\u8bb8\u591a\u865a\u62df\u673a\u53ef\u4ee5\u4f7f\u7528\u76f8\u540c\u6570\u91cf\u7684\u5185\u5b58\u542f\u52a8\u3002\u4e8b\u5b9e\u4e0a\uff0cKSM\u5141\u8bb8\u865a\u62df\u673a\u8fc7\u5ea6\u5206\u914d\u5185\u5b58\u3002\u4f46\u662f\u4f7f\u7528KSM\u5b58\u5728\u6027\u80fd\u635f\u5931\uff0c\u5728\u4e00\u822c\u7684\u73af\u5883\u4e2d\uff0c\u6027\u80fd\u635f\u5931\u5927\u6982\u662f10%\uff0c\u8fd9\u4e5f\u662f\u5728\u67d0\u4e9b\u73af\u5883\u4e2d\u5173\u95edKSM\u7684\u539f\u56e0\u3002
\n\u5728RHEL 7\uff08CentOS 7\uff09\u548cFedora 17 \u4e2d\uff0cKSM\u9ed8\u8ba4\u662f\u6253\u5f00\u7684\u3002KSM\u901a\u8fc7\u4e24\u4e2a\u670d\u52a1\uff1aksmd\u548cksmtuned\u5b9e\u73b0\uff0c\u8fd9\u4e24\u4e2a\u670d\u52a1\u5728\u7cfb\u7edf\u521d\u59cb\u5316\u65f6\u81ea\u52a8\u542f\u52a8\u3002\u7ba1\u7406\u5458\u5e94\u8be5\u5224\u65ad\u4ed6\u4eec\u7684\u73af\u5883\u5e76\u51b3\u5b9a\u4fdd\u6301KSM\u5904\u4e8e\u8fd0\u884c\u72b6\u6001\u8fd8\u662f\u5173\u95ed\u5b83\u3002<\/p>\n

\u5728\u5177\u4f53\u7684\u73af\u5883\u4e2d\u662f\u5426\u8981\u4f7f\u7528ksm\u5462\uff1f<\/p>\n

\u5982\u679c\u76ee\u6807\u662f\u8fd0\u884c\u5c3d\u53ef\u80fd\u591a\u7684\u865a\u62df\u673a\uff0c\u800c\u4e14\u6027\u80fd\u4e0d\u662f\u95ee\u9898\uff0c\u5e94\u8be5\u4fdd\u6301KSM\u5904\u4e8e\u8fd0\u884c\u72b6\u6001\u3002\u4f8b\u5982KSM\u5141\u8bb8\u8fd0\u884c30\u4e2a\u865a\u62df\u673a\u7684\u4e3b\u673a\u4e0a\u8fd0\u884c40\u4e2a\u865a\u62df\u673a\uff0c\u8fd9\u610f\u5473\u7740\u6700\u5927\u5316\u786c\u4ef6\u4f7f\u7528\u6548\u7387\u3002\u4f46\u662f\uff0c\u5982\u679c\u670d\u52a1\u5668\u5728\u8fd0\u884c\u76f8\u5bf9\u8f83\u5c11\u7684\u865a\u62df\u673a\u5e76\u4e14\u6027\u80fd\u662f\u4e2a\u95ee\u9898\u65f6\uff0c\u90a3\u4e48\u5e94\u8be5\u5173\u95edKSM\u3002<\/p>\n

\u5bf9\u4efb\u4f55\u7cfb\u7edf\u6765\u8bf4\uff0c\u6700\u4f73\u9009\u62e9\u5c06\u53d6\u51b3\u4e8e\u521b\u5efa\u865a\u62df\u73af\u5883\u65f6\u7684\u5185\u5b58\u4f30\u7b97\u3002\u5982\u679c\u5728\u865a\u62df\u4e3b\u673a\u4e2d\u6709\u8db3\u591f\u7684\u7269\u7406\u5185\u5b58\uff0c\u5728\u6ca1\u6709\u5f00\u542fKSM\u65f6\u5c31\u80fd\u591f\u6ee1\u8db3\u865a\u62df\u673a\u7684\u5185\u5b58\u9700\u6c42\uff0c\u90a3\u4e48\u6700\u597d\u5173\u95edKSM\u3002\u5173\u95ed\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

systemctl disable ksmtuned\r\nsystemctl stop ksmtuned<\/span><\/pre>\n
\u6ce8\uff1a\u5982\u679c\u4e3b\u673a\u5185\u5b58\u7d27\u5f20\uff0c\u90a3\u4e48\u6700\u597d\u4fdd\u6301KSM\u5904\u4e8e\u8fd0\u884c\u72b6\u6001\u3002<\/p>\n
\u5373\u7136\u4e0a\u9762\u5bf9ksm\u7684\u4f5c\u7528\u8fdb\u884c\u4e86\u4e86\u89e3\uff0c\u90a3\u4e48\u5982\u4f55\u5728\u4f7f\u7528ksm\u65f6\u8fdb\u884c\u8c03\u4f18\u5462\uff1f<\/p>\n
ksm\u7684\u53c2\u6570\u53ef\u4ee5\u5728\/etc\/ksmtuned.conf\u6587\u4ef6\u4e2d\u8c03\u6574\u3002\u5176\u9ed8\u8ba4\u53c2\u6570\u5982\u4e0b\uff1a<\/p>\n
$cat ksmtuned.conf\r\n# Configuration file for ksmtuned.\r\n# How long ksmtuned should sleep between tuning adjustments\r\n# KSM_MONITOR_INTERVAL=60\r\n# Millisecond sleep between ksm scans for 16Gb server.\r\n# Smaller servers sleep more, bigger sleep less.\r\n# KSM_SLEEP_MSEC=10\r\n# KSM_NPAGES_BOOST=300\r\n# KSM_NPAGES_DECAY=-50\r\n# KSM_NPAGES_MIN=64\r\n# KSM_NPAGES_MAX=1250\r\n# KSM_THRES_COEF=20\r\n# KSM_THRES_CONST=2048\r\n# uncomment the following if you want ksmtuned debug info\r\n# LOGFILE=\/var\/log\/ksmtuned\r\n# DEBUG=1<\/span><\/pre>\n
\u5982\u679c\u4f60\u60f3\u83b7\u53d6\u4f18\u5316KSM\u7684\u8c03\u8bd5\u4fe1\u606f\uff0c\u53d6\u6d88\u4ee5\u4e0b\u6ce8\u91ca\uff1a<\/p>\n
# LOGFILE=\/var\/log\/ksmtuned\r\n# DEBUG=1<\/span><\/pre>\n
\u914d\u7f6e\u6587\u4ef6\u4e2d\u6700\u91cd\u8981\u7684\u53c2\u6570\u662fKSM_SLEEP_MSEC\u3002Fedora 16\u4f7f\u7528\u7684\u9ed8\u8ba4\u503c\u662f\u5927\u578b\u670d\u52a1\u5668\u7684\u8bbe\u7f6e\u503c\u3002\u5f53\u5728\u4e3b\u673a\u4e0a\u8fd0\u884c\u8f83\u5c11\u7684\u865a\u62df\u673a\uff0c\u4f7f\u7528KSM\u65f6\u6700\u597d\u8ba9\u4e3b\u673a\u4f11\u7720\u66f4\u957f\u7684\u65f6\u95f4\u3002\u4f8b\u5982\uff0c\u5c1d\u8bd5\u8bbe\u7f6eKSM_SLEEP_MSEC=50\uff0c\u7136\u540e\u6d4b\u8bd5\u5bf9\u865a\u62df\u673a\u7684\u5f71\u54cd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5929\u5728\u767b\u9646\u4e00\u53f0KVM\u7269\u7406\u673a\u65f6\uff0c\u53d1\u73b0\u8fdb\u7a0bksmd\u7adf\u7136\u5360\u752850%\u4ee5\u4e0a\u7684cpu\uff0c\u8f83\u4e4b\u5355\u4e2a … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-149","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/149","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=149"}],"version-history":[{"count":1,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/149\/revisions"}],"predecessor-version":[{"id":150,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/149\/revisions\/150"}],"wp:attachment":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=149"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=149"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=149"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}