{"id":8806,"date":"2016-09-05T14:56:42","date_gmt":"2016-09-05T12:56:42","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/"},"modified":"2016-09-05T14:56:42","modified_gmt":"2016-09-05T12:56:42","slug":"disable-red-hat-7-transparent-hugepages","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/","title":{"rendered":"Disable Red Hat 7 Transparent Hugepages"},"content":{"rendered":"<h2>Ausgangslage<\/h2>\n<p>Ein Kunde hat mich k\u00fcrzlich angefragt, wie am effizientesten alle Kernel Tuning Parameter f\u00fcr Oracle bei Red Hat 7 konfiguriert werden k\u00f6nnen. Daraus habe ich untersucht welche M\u00f6glichkeiten es gibt, ausser\u00a0dem seit langer Zeit bekannten \/etc\/sysctl.conf. Bei dieser Analyse f\u00fchrt der Weg nat\u00fcrlich \u00fcber tuned. Dieser Dienst erlaubt es Profile zu definieren welche ein ganzes Set von Kernel Tuningparametern enth\u00e4lt. Das habe ich bereits in einem BLOG &#8220;<a title=\"Stay tuned with kernel parameter\" href=\"http:\/\/dbi-services.com\/blog\/stay-tuned-with-kernel-parameters\/\">Stay tuned with kernel parameters<\/a>&#8221; publiziert. Tuned ist seit Red Hat Linux 7 standardm\u00e4ssig enabled!<\/p>\n<h2><\/h2>\n<h2>Welche M\u00f6glichkeiten gibt es?<\/h2>\n<p>Bei Red Hat Linux 7 sind standardm\u00e4ssig die THP (Transparent Hugepages) eingeschalten. Wird eine Oracle Datenbank auf diesem Server installiert, ist es dringend zu empfehlen die THP auszuschalten. Oracle gibt\u00a0einen\u00a0erheblichen\u00a0Performance verlust\u00a0an werden\u00a0die THP nicht\u00a0ausgeschalten.<\/p>\n<p>Um die THP auszuschalten gibt es nun unterschiedliche Wege (der Weg f\u00fchrt \u00fcber Kernel Boot-Parameter):<\/p>\n<ul>\n<li>Variante 1: Kernel Boot-Parameter \/boot\/grub2\/grub.cfg<\/li>\n<li>Variante 2: Kernel Boot-Parameter \/etc\/default\/grub.conf<\/li>\n<li>Variante 3: Kernel Boot-Parameter \/usr\/lib\/tuned\/oracle\/tuned.conf<\/li>\n<\/ul>\n<p>Jeder der aufgef\u00fchrten\u00a0Varianten hat wie immer Vor und Nachteile.<\/p>\n<h3><\/h3>\n<h3>Variante 1: (\/boot\/grub2\/grub.cfg)<\/h3>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">menuentry 'Red Hat Enterprise Linux Server (3.10.0-327.28.3.el7.x86_64) 7.2 (Maipo)' --class red --class gnu-linux --class gnu --class os --unrestri\ncted $menuentry_id_option 'gnulinux-3.10.0-327.28.3.el7.x86_64-advanced-5b1a0ee8-c384-47be-99be-6d09a44d9583' {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 load_video\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set gfxpayload=keep\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 insmod gzio\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 insmod part_msdos\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 insmod xfs\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set root='hd0,msdos1'\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if [ x$feature_platform_search_hint = xy ]; then\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'\u00a0 69\n06b305-a050-4815-8e4b-79202d7ba9fa\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 else\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 search --no-floppy --fs-uuid --set=root 6906b305-a050-4815-8e4b-79202d7ba9fa\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fi\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 linux16 \/vmlinuz-3.10.0-327.28.3.el7.x86_64 root=\/dev\/mapper\/rhel-root ro crashkernel=auto rd.lvm.lv=rhel\/root rd.lvm.lv=rhel\/swap rhgb quie\nt transparent_hugepage=never\n\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 initrd16 \/initramfs-3.10.0-327.28.3.el7.x86_64.img\n}<\/pre>\n<p>Hier wurde die Zeile in der der Kernel Aufruf ist, mit <strong>&#8220;transparent_hugepage=never&#8221;<\/strong> erweitert.<\/p>\n<p>Nachteil, wird eine neue Kernel Version installiert muss dieser Eintrag dort manuell nachgef\u00fchrt werden. Hier handelt es sich bestenfalls um eine schnelle M\u00f6glichkeit f\u00fcr einen Test und nicht um eine permanente L\u00f6sung.<\/p>\n<h3><\/h3>\n<h3>Variante 2: (\/etc\/default\/grub.cfg)<\/h3>\n<p>[root@redhat72 \u00a0~]# cat \/etc\/default\/grub<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">GRUB_TIMEOUT=5\nGRUB_DISTRIBUTOR=\"$(sed 's, release .*$,,g' \/etc\/system-release)\"\nGRUB_DEFAULT=saved\nGRUB_DISABLE_SUBMENU=true\nGRUB_TERMINAL_OUTPUT=\"console\"\nGRUB_CMDLINE_LINUX=\"crashkernel=auto rd.lvm.lv=rhel\/root rd.lvm.lv=rhel\/swap rhgb quiet transparent_hugepage=never hugepages=100\"\nGRUB_DISABLE_RECOVERY=\"true\" GRUB_CMDLINE_LINUX_DEFAULT=\"${GRUB_CMDLINE_LINUX_DEFAULT:+$GRUB_CMDLINE_LINUX_DEFAULT }\"\n\n<\/pre>\n<p>Hier wurde die Zeile &#8220;GRUB_CMDLINE_LINUX=&#8221;, mit <strong>&#8220;transparent_hugepage=never hugepages=100&#8221;<\/strong> erweitert. Vorteil, es wird bei jedem neuen Kernel der installiert wird automatisch erg\u00e4nzt im \/boot\/grub2\/grub.cfg. Im Vergleich zur Variante 1, schon eher am richtigen Ort, aber es geht noch etwas besser&#8230;.<\/p>\n<h3><\/h3>\n<h3>Variante 3: (\/usr\/lib\/tuned\/oracle\/tuned.conf)<\/h3>\n<p>Jetzt kommen in Abh\u00e4ngigkeit des gew\u00e4hlten tuned Profile, die Kernel Boot-Parameter in die \/boot\/grub2\/grub.cfg. Ein solches tuned Profile z.B. f\u00fcr Oracle:<\/p>\n<pre class=\"brush: shell; gutter: true; first-line: 1\">[root@redhat72 ~]# cat \/usr\/lib\/tuned\/oracle\/tuned.conf \n#\n# tuned configuration\n# maintained by dbi services, GGR\u00a024.08.2016\n[main]\ninclude=throughput-performance\n[bootloader]\ncmdline = \"transparent_hugepage=never\"\n[sysctl]\nvm.swappiness = 1\nvm.dirty_background_ratio = 3\nvm.dirty_ratio = 80\nvm.dirty_expire_centisecs = 500\nvm.dirty_writeback_centisecs = 100\nvm.nr_hugepages = 100\nkernel.shmmax = 4398046511104\n#\n# Half the size of physical memory in bytes\n# See My Oracle Support Note 567506.1 for additional information about\n# configuring shmmax\n#\nkernel.shmall = 1073741824\n#\n# 40 percent of the size of physical memory in pages\n# Note: If the server supports multiple databases, or uses a large SGA,\n# then set this parameter to a value that is equal to the total amount\n# of shared memory, in 4K pages, that the system can use at one time\n#\nkernel.shmmni = 4096\nkernel.msgmni = 2878\nkernel.msgmnb = 65536\nkernel.msgmax = 65536\n# kernel.sem = 250 32000 100 128\n# on oracle engineered systems\nkernel.sem = 4096 256000 100 4096\nfs.file-max = 6815744\nfs.aio-max-nr = 3145728\nnet.ipv4.ip_local_port_range = 9000 65500\nnet.core.rmem_default = 262144\nnet.core.rmem_max = 4194304\nnet.core.wmem_default = 262144\nnet.core.wmem_max = 1048576\nkernel.panic_on_oops = 1<\/pre>\n<p>&nbsp;<\/p>\n<p>Der spezielle Abschnitt in dem Konfigurationsfile ist die &#8220;bootloader&#8221; Sektion, mit darauf folgendem Befehl:\u00a0<strong>tuned-adm profile oracle<\/strong> wird das Profile aktiviert.<\/p>\n<p>Das hat den grossen Vorteil, wird ein anderes tuned Profile selektiert k\u00f6nnen andere Parameter gesetzt werden. Diese Methode\u00a0erlaubt die Konfiguration, ausschalten der THP und festlegen der gr\u00f6sse der HugePages in einem Profile und das nur an einer Stelle, im oracle\/tune.cfg.<\/p>\n<p>Nachteil, es muss nach der Anpassung mit <strong>grub2-mkconfig -o \/boot\/grub2\/grub.cfg<\/strong>, noch die \/boot\/grub2\/grub.cfg neu\u00a0Erstellt werden.<\/p>\n<p>[root@redhat72 ~]# grub2-mkconfig -o \/boot\/grub2\/grub.cfg<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">Generating grub configuration file ...\nFound linux image: \/boot\/vmlinuz-3.10.0-327.28.3.el7.x86_64\nFound initrd image: \/boot\/initramfs-3.10.0-327.28.3.el7.x86_64.img\nFound linux image: \/boot\/vmlinuz-3.10.0-327.28.2.el7.x86_64\nFound initrd image: \/boot\/initramfs-3.10.0-327.28.2.el7.x86_64.img\nFound linux image: \/boot\/vmlinuz-3.10.0-327.el7.x86_64\nFound initrd image: \/boot\/initramfs-3.10.0-327.el7.x86_64.img\nFound linux image: \/boot\/vmlinuz-0-rescue-29b38e2132e04639809cde7749271d64\nFound initrd image: \/boot\/initramfs-0-rescue-29b38e2132e04639809cde7749271d64.img\ndone\n[root@redhat72 ~]#<\/pre>\n<p>&nbsp;<\/p>\n<p>Mit dem letzten Schritt, werden einige Dinge automatisch angepasst:<\/p>\n<ul>\n<li>Parameter auf der command_line_linux_default im \/etc\/default\/grub<\/li>\n<li>Parameter auf der Kernelzeile im \/boot\/grub2\/grub.cfg<\/li>\n<li>angepasstes File unter \/etc\/tuned\/bootcmdline<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>\/boot\/grubs\/grub.cfg<\/strong><\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">linux16 \/vmlinuz-3.10.0-327.28.3.el7.x86_64 root=\/dev\/mapper\/rhel-root ro crashkernel=auto rd.lvm.lv=rhel\/root rd.lvm.lv=rhel\/swap rhgb quie\nt $tuned_params<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\/etc\/default\/grub<\/strong><\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">GRUB_CMDLINE_LINUX_DEFAULT=\"${GRUB_CMDLINE_LINUX_DEFAULT:+$GRUB_CMDLINE_LINUX_DEFAULT }$tuned_params\"<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>\/etc\/tuned\/bootcmdline<\/strong><\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">TUNED_BOOT_CMDLINE=\"transparent_hugepage=never\"<\/pre>\n<p>Damit die ganzen\u00a0Anpassungen Wirkung\u00a0zeigen, muss ein Reboot des Servers durchgef\u00fchrt werden.<\/p>\n<p><strong>Pr\u00fcfen der Anpassungen:<\/strong><\/p>\n<p>Nun wollen\u00a0wir\u00a0die ganzen Anpassungen auch \u00fcberpr\u00fcfen, speziell die AnonHugePages sind\u00a0die transparenten Hugepages, auf das achten wir jetzt:<\/p>\n<p>Wie sehen uns die HugePage Konfiguration vor\u00a0der Konfiguration an:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">[root@redhat72 ~]# cat \/proc\/meminfo | grep Huge\nAnonHugePages: 6144 kB\nHugePages_Total: 100\nHugePages_Free: 100\nHugePages_Rsvd: 0\nHugePages_Surp: 0\nHugepagesize: 2048 kB<\/pre>\n<p>Wir sehen uns\u00a0die Konfiguration nach der Konfiguration an:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">[root@redhat72 ~]# cat \/proc\/meminfo | grep Huge\nAnonHugePages: 0 kB\nHugePages_Total: 100\nHugePages_Free: 100\nHugePages_Rsvd: 0\nHugePages_Surp: 0\nHugepagesize: 2048 kB<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Fazit:<\/strong><\/p>\n<p>Wird mit tuned gearbeitet und werden auf diese Art die Kernel-Parameter f\u00fcr z.B. f\u00fcr Oracle gesetzt, so k\u00f6nnen auf die gleiche Art auch gerade noch die THP ausgeschaltet und die Anzahl der HugePages welche bereitsgestellt werden sollen konfiguriert werden.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ausgangslage Ein Kunde hat mich k\u00fcrzlich angefragt, wie am effizientesten alle Kernel Tuning Parameter f\u00fcr Oracle bei Red Hat 7 konfiguriert werden k\u00f6nnen. Daraus habe ich untersucht welche M\u00f6glichkeiten es gibt, ausser\u00a0dem seit langer Zeit bekannten \/etc\/sysctl.conf. Bei dieser Analyse f\u00fchrt der Weg nat\u00fcrlich \u00fcber tuned. Dieser Dienst erlaubt es Profile zu definieren welche ein [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,42],"tags":[804,908],"type_dbi":[],"class_list":["post-8806","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-operating-systems","tag-red-hat-linux-7","tag-transparent-hugepages"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Disable Red Hat 7 Transparent Hugepages - dbi Blog<\/title>\n<meta name=\"description\" content=\"Auf welche Art k\u00f6nnen die Transparent Hugepages disabled werden unter Red Hat Linux 7\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Disable Red Hat 7 Transparent Hugepages\" \/>\n<meta property=\"og:description\" content=\"Auf welche Art k\u00f6nnen die Transparent Hugepages disabled werden unter Red Hat Linux 7\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-09-05T12:56:42+00:00\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Disable Red Hat 7 Transparent Hugepages\",\"datePublished\":\"2016-09-05T12:56:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/disable-red-hat-7-transparent-hugepages\/\"},\"wordCount\":591,\"commentCount\":0,\"keywords\":[\"Red Hat Linux 7\",\"Transparent Hugepages\"],\"articleSection\":[\"Database Administration &amp; 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