{"id":844,"date":"2018-05-29T16:37:27","date_gmt":"2018-05-29T13:37:27","guid":{"rendered":"https:\/\/galaxydata.ru\/community\/?p=844"},"modified":"2025-07-22T22:18:00","modified_gmt":"2025-07-22T19:18:00","slug":"kernel-4-centos-7-ili-io-wait","status":"publish","type":"post","link":"https:\/\/galaxydata.ru\/community\/kernel-4-centos-7-ili-io-wait-844","title":{"rendered":"Kernel 4 CentOS 7 \u0438\u043b\u0438 IO wait"},"content":{"rendered":"<h1 class=\"title\">\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u044f\u0434\u0440\u0430 \u0432 CentOS \u0434\u043e \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438<\/h1>\n<p>\u0421\u043f\u0438\u0441\u043e\u043a \u043a\u043e\u043c\u0430\u043d\u0434 \u0434\u043b\u044f \u0431\u044b\u0441\u0442\u0440\u043e\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f:<\/p>\n<pre class=\"lang:sh decode:true \">rpm --import https:\/\/www.elrepo.org\/RPM-GPG-KEY-elrepo.org\r\nrpm -Uvh http:\/\/elrepo.org\/linux\/kernel\/el7\/x86_64\/RPMS\/elrepo-release-7.0-3.el7.elrepo.noarch.rpm\r\nyum --enablerepo=elrepo-kernel install kernel-ml kernel-ml-devel -y\r\ngrub2-set-default 'CentOS Linux (4.20.10-1.el7.elrepo.x86_64) 7 (Core)'\r\ngrub2-mkconfig -o \/boot\/grub2\/grub.cfg\r\ngrub2-editenv list\r\n\r\nyum install yum-utils\r\npackage-cleanup --oldkernels --count=2\r\n\r\nnano \/etc\/yum.conf\r\n##add\r\n\r\nexclude=kernel.x86_64\r\n\r\n# tuned on virual server\r\ntuned-adm profile virtual-guest\r\ntuned-adm active\r\n===\r\n\r\nmodprobe tcp_bbr \r\necho  \"tcp_bbr\" | sudo tee -a \/etc\/modules-load.d\/modules.conf\r\necho  \"net.core.default_qdisc = fq\"   | sudo tee -a \/etc\/sysctl.conf \r\necho  \"net.ipv4.tcp_congestion_control = bbr\" | sudo tee -a \/etc\/sysctl.conf \r\necho  \"# allow testing with buffers up to 64MB\r\nnet.core.rmem_max = 67108864\r\nnet.core.wmem_max = 67108864\r\n# increase Linux autotuning TCP buffer limit to 32MB\r\nnet.ipv4.tcp_rmem = 4096 87380 33554432\r\nnet.ipv4.tcp_wmem = 4096 65536 33554432\r\n# recommended default congestion control is htcp\r\nnet.ipv4.tcp_congestion_control=htcp\r\n# recommended for hosts with jumbo frames enabled\r\nnet.ipv4.tcp_mtu_probing=1\r\n# recommended for CentOS7\/Debian8 hosts\r\nnet.core.default_qdisc = fq \" | sudo tee -a \/etc\/sysctl.conf \r\nsysctl -p\r\n\r\n==\r\ncheck\r\n-\r\nsysctl net.ipv4.tcp_available_congestion_control\r\nsysctl net.ipv4.tcp_congestion_control\r\n\r\n==\r\nyum --enablerepo=elrepo-kernel install kernel-ml kernel-ml-devel kernel-ml-headers -y<\/pre>\n<div class=\"content\">\n<p>\u0412 \u0434\u0430\u043d\u043d\u043e\u043c \u043f\u043e\u0441\u0442\u0435 \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u044f\u0434\u0440\u0430 \u0432 CentOS 6,7 \u0434\u043e \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438.<\/p>\n<p><strong>\u0428\u0430\u0433 1. \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0443<\/strong><\/p>\n<p>\u0418\u043c\u043f\u043e\u0440\u0442\u0438\u0440\u0443\u0435\u043c \u043a\u043b\u044e\u0447<\/p>\n<pre class=\"lang:sh decode:true \">rpm --import https:\/\/www.elrepo.org\/RPM-GPG-KEY-elrepo.org<\/pre>\n<p>&nbsp;<\/p>\n<p>\u0414\u043e\u0431\u0430\u0432\u043b\u044f\u0435\u043c \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439 \u0434\u043b\u044f CentOS 7<\/p>\n<pre class=\"lang:sh decode:true\">rpm -Uvh http:\/\/www.elrepo.org\/elrepo-release-7.0-2.el7.elrepo.noarch.rpm<\/pre>\n<p>\u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f \u0434\u043b\u044f CentOS 6\u00a0<strong>(\u0412\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u043f\u0435\u0440\u0435\u0434 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u043e\u0439 \u044f\u0434\u0440\u0430 \u043d\u0443\u0436\u043d\u043e \u043e\u0431\u043d\u043e\u0432\u0438\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u0443 \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439 yum upgrade)<\/strong><\/p>\n<pre class=\"lang:sh decode:true \">rpm -Uvh http:\/\/www.elrepo.org\/elrepo-release-6-6.el6.elrepo.noarch.rpm<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\u0428\u0430\u0433 2. \u0423\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c \u043f\u043b\u0430\u0433\u0438\u043d yum-plugin-fastestmirror<\/strong><\/p>\n<pre class=\"lang:sh decode:true \">yum install yum-plugin-fastestmirror<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\u0428\u0430\u0433 3. \u041f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u043c \u0442\u0435\u043a\u0443\u0449\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e \u044f\u0434\u0440\u0430<\/strong><\/p>\n<pre class=\"lang:sh decode:true \">uname -r<\/pre>\n<p>&nbsp;<\/p>\n<p>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0434\u043b\u044f CentOS 7<br \/>\n<img decoding=\"async\" class=\"image-center\" title=\"\u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u044f\u0434\u0440\u0430 \u0432 CentOS\" src=\"http:\/\/blog.vpsville.ru\/uploads\/images\/00\/00\/03\/2016\/06\/01\/969fb2.jpg\" alt=\"\u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u044f\u0434\u0440\u0430 \u0432 CentOS\" \/><\/p>\n<p><code><span class=\"pun\">\u0428\u0430\u0433<\/span> <span class=\"lit\">4.<\/span> <span class=\"pun\">\u0423\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c<\/span> <span class=\"pun\">\u043f\u043e\u0441\u043b\u0435\u0434\u043d\u044e\u044e<\/span> <span class=\"pun\">\u0432\u0435\u0440\u0441\u0438\u044e<\/span> <span class=\"pun\">\u044f\u0434\u0440\u0430<\/span> <span class=\"pun\">\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u0443\u044e<\/span> <span class=\"pun\">\u0432<\/span> <span class=\"pun\">\u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0438.<\/span><\/code><\/p>\n<pre class=\"lang:sh decode:true\">yum --enablerepo=elrepo-kernel install kernel-ml<\/pre>\n<p>\u043f\u0430\u043a\u0435\u0442 kernel-ml \u044d\u0442\u043e \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0439 \u0440\u0435\u043b\u0438\u0437 \u044f\u0434\u0440\u0430.<\/p>\n<p><img decoding=\"async\" class=\"image-center\" title=\"\u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 \u044f\u0434\u0440\u0430 \u0432 CentOS\" src=\"http:\/\/blog.vpsville.ru\/uploads\/images\/00\/00\/03\/2016\/06\/01\/dae225.jpg\" alt=\"\u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 \u044f\u0434\u0440\u0430 \u0432 CentOS\" \/><\/p>\n<p>\u041a\u0430\u043a \u0432\u0438\u0434\u043d\u043e \u0438\u0437 \u0441\u043a\u0440\u0438\u043d\u0430 \u043c\u044b \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u043b\u0438 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u044e\u044e \u0432\u0435\u0440\u0441\u0438\u044e \u044f\u0434\u0440\u0430 CentOS (\u041d\u0430 \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u044d\u0442\u043e \u0432\u0435\u0440\u0441\u0438\u044f 4.6)<\/p>\n<p>\u041f\u0435\u0440\u0435\u0433\u0440\u0443\u0436\u0430\u0435\u043c \u0441\u0438\u0441\u0442\u0435\u043c\u0443<\/p>\n<pre class=\"lang:sh decode:true \">reboot<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\u0428\u0430\u0433 5. \u0412\u044b\u0431\u043e\u0440 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b.<\/strong><\/p>\n<p>\u041f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043c\u044b \u0443\u0432\u0438\u0434\u0438\u043c \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u043e\u0435 \u044f\u0434\u0440\u043e<br \/>\n<img decoding=\"async\" class=\"image-center\" title=\"\u0412\u044b\u0431\u043e\u0440 \u044f\u0434\u0440\u0430 CentOS \u043f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b\" src=\"http:\/\/blog.vpsville.ru\/uploads\/images\/00\/00\/03\/2016\/06\/01\/528b8b.jpg\" alt=\"\u0412\u044b\u0431\u043e\u0440 \u044f\u0434\u0440\u0430 CentOS \u043f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b\" \/><\/p>\n<p><strong>\u0428\u0430\u0433 6. \u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 CentOS \u0430 \u0442\u0430\u043a \u0436\u0435 \u043e\u043f\u0446\u0438\u0438 <\/strong><\/p>\n<pre class=\"lang:sh decode:true \">net.ipv6.ip_nonlocal_bind<\/pre>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"image-center\" title=\"\u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 CentOS\" src=\"http:\/\/blog.vpsville.ru\/uploads\/images\/00\/00\/03\/2016\/06\/01\/b64c74.jpg\" alt=\"\u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 CentOS\" \/><\/p>\n<p>P.S. \u0434\u043b\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0441 \u043d\u043e\u0432\u044b\u043c \u044f\u0434\u0440\u043e\u043c 4.6 \u043d\u0443\u0436\u043d\u043e \u0432\u043d\u0435\u0441\u0442\u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a grub2 \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439<\/p>\n<pre class=\"lang:sh decode:true \">grub2-set-default 0<\/pre>\n<p>&nbsp;<\/p>\n<p>\u0432 \u044d\u0442\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0442\u044c\u0441\u044f \u043f\u0435\u0440\u0432\u043e\u0435 \u043f\u043e \u0441\u043f\u0438\u0441\u043a\u0443 \u044f\u0434\u0440\u043e.<br \/>\n\u0414\u043b\u044f \u043f\u0440\u043e\u0441\u043c\u043e\u0442\u0440\u0430 \u0434\u0435\u0444\u043e\u043b\u0442\u043d\u043e\u0433\u043e \u043f\u0443\u043d\u043a\u0442\u0430 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u043c\u043e\u0436\u043d\u043e \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439<\/p>\n<pre class=\"lang:sh decode:true \">grub2-editenv list<\/pre>\n<p>&nbsp;<\/p>\n<p>\u0412\u044b\u0432\u043e\u0434<br \/>\n<img decoding=\"async\" class=\"image-center\" title=\"\u041d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 grub2 \u0432 CentOS\" src=\"http:\/\/blog.vpsville.ru\/uploads\/images\/00\/00\/03\/2016\/06\/01\/f5069d.jpg\" alt=\"\u041d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 grub2 \u0432 CentOS\" \/><\/p>\n<\/div>\n<p>\u0414\u0430\u043b\u0435\u0435, \u043d\u0443\u0436\u043d\u043e \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043d\u043e\u0432\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f \u044f\u0434\u0440\u0430 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0430 \u0438 \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e \u043f\u0440\u043e\u043f\u0438\u0441\u0430\u043d\u0430 \u0432 \u0430\u0432\u0442\u043e\u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0435<br \/>\n?<br \/>\n1<\/p>\n<pre class=\"lang:sh decode:true \">cat \/boot\/grub2\/grub.cfg | grep\u00a0'CentOS Linux (4'<\/pre>\n<p>&nbsp;<\/p>\n<p>\u041d\u0430 \u0434\u0430\u043d\u043d\u043e\u043c \u044d\u0442\u0430\u043f\u0435 \u0432\u0430\u0436\u043d\u043e \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u044f\u0442\u044c \u0432 \u044d\u0442\u043e\u043c \u0444\u0430\u0439\u043b\u0435, \u0442\u0430\u043a \u043a\u0430\u043a \u043e\u043d \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438. \u0412\u0441\u0435 \u0447\u0442\u043e \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e &#8212; \u044d\u0442\u043e \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043d\u043e\u0432\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f \u044f\u0434\u0440\u0430 \u0432 \u043d\u0435\u043c \u0443\u043a\u0430\u0437\u0430\u043d\u0430 \u0438 \u0441\u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0435\u0435 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435.<\/p>\n<p>\u041f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e, \u043a\u0430\u043a \u043d\u043e\u0432\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f \u044f\u0434\u0440\u0430 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0430, \u043e\u043d\u0430 \u0432\u0441\u0435 \u0435\u0449\u0435 \u043d\u0435 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043a\u0443\u0449\u0435\u0439. \u0422.\u0435. \u043f\u0440\u0438 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u043f\u0435\u0440\u0435\u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0434\u043e\u043b\u0436\u043d\u043e \u043f\u043e\u044f\u0432\u0438\u0442\u044c\u0441\u044f \u043e\u043a\u043d\u043e \u0432\u044b\u0431\u043e\u0440\u0430 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e.<\/p>\n<p>\u041d\u043e, \u0442\u0430\u043a \u043a\u0430\u043a \u043c\u044b \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u043c \u0441 \u0441\u0438\u0441\u0442\u0435\u043c\u043e\u0439 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0442\u0435\u0440\u043c\u0438\u043d\u0430\u043b\u0430 SSH, \u0443\u0432\u0438\u0434\u0435\u0442\u044c \u0432\u044b\u0431\u043e\u0440 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043d\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u043c (\u043d\u043e \u0435\u0441\u043b\u0438 \u0435\u0441\u0442\u044c \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u0447\u0435\u0440\u0435\u0437 KVM \u044d\u0442\u043e \u0432\u0441\u0435 \u0443\u043f\u0440\u043e\u0449\u0430\u0435\u0442), \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u044f\u0434\u0440\u043e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0431\u0443\u0434\u0435\u043c \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0442\u044c \u0432 \u0440\u0443\u0447\u043d\u043e\u043c \u0440\u0435\u0436\u0438\u043c\u0435.<\/p>\n<p>\u041d\u0430 \u0432\u0441\u044f\u043a\u0438\u0439 \u0441\u043b\u0443\u0447\u0430\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u043c \u043a\u0430\u043a\u043e\u0435 \u044f\u0434\u0440\u043e \u0437\u0430\u0433\u0440\u0443\u0436\u0435\u0442\u0441\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e<br \/>\n?<br \/>\n1<br \/>\n# cat \/etc\/default\/grub<\/p>\n<p>\u0412 \u0444\u0430\u0439\u043b\u0435 \u0443\u0432\u0438\u0434\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u0441\u0442\u0440\u043e\u043a\u0443<br \/>\n?<br \/>\n1<br \/>\nGRUB_DEFAULT=saved<\/p>\n<p>\u0427\u0442\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u044f\u044f \u0441\u043e\u0445\u0440\u0430\u043d\u0435\u043d\u043d\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f.<br \/>\n\u041a\u0430\u043a\u0430\u044f \u0436\u0435 \u0432\u0435\u0440\u0441\u0438\u044f \u044f\u0434\u0440\u0430 \u0431\u044b\u043b\u0430 \u0437\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439?<br \/>\n\u042d\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0443\u0432\u0438\u0434\u0435\u0442\u044c \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u044b<br \/>\n?<br \/>\n1<br \/>\n# grub2-editenv list<\/p>\n<p>\u0412 \u043e\u0442\u0432\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0435<br \/>\n?<br \/>\n1<br \/>\nsaved_entry=CentOS Linux (3.10.0-229.20.1.el7.x86_64) 7 (Core)<br \/>\n\u0420\u0430\u0437\u0443\u043c\u0435\u0435\u0442\u0441\u044f, \u0442\u043e\u0447\u043d\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f \u043c\u043e\u0436\u0435\u0442 \u043e\u0442\u043b\u0438\u0447\u0430\u0442\u044c\u0441\u044f.<\/p>\n<p>\u0414\u0430\u043b\u0435\u0435, \u0440\u0443\u0447\u043a\u0430\u043c\u0438 \u0438\u0437\u043c\u0435\u043d\u044f\u0435\u043c \u0432\u0435\u0440\u0441\u0438\u044e \u044f\u0434\u0440\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e<br \/>\n?<br \/>\n1<br \/>\n# grub2-set-default [title number=&#187;&#187; or=&#187;&#187;]<br \/>\n\u0413\u0434\u0435 title \u0431\u0443\u0434\u0435\u0442 \u0442\u043e\u0447\u043d\u044b\u0439 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a \u043d\u043e\u0432\u043e\u0433\u043e \u044f\u0434\u0440\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u044b \u0443\u0432\u0438\u0434\u0435\u043b\u0438 (\u0438 \u0441\u043a\u043e\u043f\u0438\u0440\u043e\u0432\u0430\u043b\u0438) \u0440\u0430\u043d\u0435\u0435 \u0432 \u0444\u0430\u0439\u043b\u0435 \/boot\/grub2\/grub.cfg<\/p>\n<p>\u0412 \u043c\u043e\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043d\u043e\u0432\u043e\u0435 \u044f\u0434\u0440\u043e \u0438\u043c\u0435\u0435\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a<br \/>\n?<br \/>\n1<br \/>\nCentOS Linux (4.4.0-1.el7.elrepo.x86_64) 7 (Core)<\/p>\n<p>\u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u043f\u043e \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044e \u044f\u0434\u0440\u0430, \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u043e\u0433\u043e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c<br \/>\n?<br \/>\n1<\/p>\n<pre class=\"lang:sh decode:true\">grub2-set-default\u00a0'CentOS Linux (4.16.13-1.el7.elrepo.x86_64) 7 (Core)'<\/pre>\n<p>&nbsp;<\/p>\n<p>\u0412\u0430\u0436\u043d\u043e &#8212; \u0432\u0435\u0441\u044c \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a \u043e\u0431\u043e\u0440\u0430\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 \u043e\u0434\u0438\u043d\u0430\u0440\u043d\u044b\u0435 \u043a\u0430\u0432\u044b\u0447\u043a\u0438.<\/p>\n<p>\u041f\u043e\u0441\u043b\u0435 \u044d\u0442\u043e\u0433\u043e \u0435\u0449\u0435 \u0440\u0430\u0437 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u043c \u0432\u0435\u0440\u0441\u0438\u044e \u044f\u0434\u0440\u0430 \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u043e\u0433\u043e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e<br \/>\n?<br \/>\n1<br \/>\n# grub2-editenv list<\/p>\n<p>\u041d\u0430 \u044d\u0442\u043e\u043c \u044d\u0442\u0430\u043f\u0435 \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0435\u043c \u043d\u043e\u0432\u0443\u044e \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044e \u0430\u0432\u0442\u043e\u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a\u0430<br \/>\n?<br \/>\n1<br \/>\n# grub2-mkconfig -o \/boot\/grub2\/grub.cfg<\/p>\n<p>\u041d\u0443 \u0438, \u043d\u0430\u043a\u043e\u043d\u0435\u0446, \u043f\u0435\u0440\u0435\u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c \u0441\u0438\u0441\u0442\u0435\u043c\u0443<br \/>\n?<br \/>\n1<br \/>\n# reboot<\/p>\n<p>\u041f\u043e\u0441\u043b\u0435 \u0442\u043e\u0433\u043e, \u043a\u0430\u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u043f\u0435\u0440\u0435\u0437\u0430\u0433\u0440\u0443\u0437\u0438\u043b\u0430\u0441\u044c \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0442\u0435\u043a\u0443\u0449\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e \u044f\u0434\u0440\u0430<br \/>\n?<br \/>\n1<br \/>\n# uname -r<\/p>\n<p>\u0412 \u043c\u043e\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0432\u044b\u0432\u043e\u0434 \u0431\u0443\u0434\u0435\u0442 \u0442\u0430\u043a\u0438\u043c<br \/>\n?<br \/>\n1<br \/>\n4.4.0-1.el7.elrepo.x86_64<\/p>\n<p>\u041d\u0430 \u044d\u0442\u043e\u043c, \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u0430\u043f\u0433\u0440\u0435\u0439\u0434 \u044f\u0434\u0440\u0430 CentOS 7 \u0437\u0430\u043a\u043e\u043d\u0447\u0435\u043d.<\/p>\n<p>&nbsp;<\/p>\n<p>http:\/\/blog.stolbunsky.com\/2016\/01\/upgrade-centos7-kernel.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u044f\u0434\u0440\u0430 \u0432 CentOS \u0434\u043e \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0421\u043f\u0438\u0441\u043e\u043a \u043a\u043e\u043c\u0430\u043d\u0434 \u0434\u043b\u044f \u0431\u044b\u0441\u0442\u0440\u043e\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f: rpm &#8212;import https:\/\/www.elrepo.org\/RPM-GPG-KEY-elrepo.org rpm -Uvh http:\/\/elrepo.org\/linux\/kernel\/el7\/x86_64\/RPMS\/elrepo-release-7.0-3.el7.elrepo.noarch.rpm yum &#8212;enablerepo=elrepo-kernel install kernel-ml kernel-ml-devel -y grub2-set-default &#8216;CentOS Linux (4.20.10-1.el7.elrepo.x86_64) 7 (Core)&#8217;&hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[4],"class_list":["post-844","post","type-post","status-publish","format-standard","hentry","category-linux","tag-centos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v25.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Kernel 4 CentOS 7 \u0438\u043b\u0438 IO wait - GalaxyData Community<\/title>\n<meta name=\"description\" content=\"\u041e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u0443\u0435\u043c \u0440\u0430\u0431\u043e\u0442\u0443 CentOS 7 \u0441 \u043d\u043e\u0432\u044b\u043c \u044f\u0434\u0440\u043e\u043c Linux 4.x, \u0443\u043c\u0435\u043d\u044c\u0448\u0430\u044f \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0443 \u0432\u0432\u043e\u0434\u0430-\u0432\u044b\u0432\u043e\u0434\u0430 (\u00abIO wait\u00bb) \u0438 \u0443\u043b\u0443\u0447\u0448\u0430\u044f \u043e\u0431\u0449\u0443\u044e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u0443\u0442\u0435\u043c \u0442\u043e\u043d\u043a\u043e\u0439 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u043a\u0435\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u0438\u0441\u043a\u043e\u0432.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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