Transparent Hugepage is not getting disabled (Doc ID 2279458.1)

Transparent Hugepage is not getting disabled (Doc ID 2279458.1)

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In this Document   Symptoms   Cause   Solution   References   APPLIES TO: Linux OS - Version Oracle Linux 6.8 with Unbreakable Enterprise Kernel [4.1.12] and later Information in this document applies to any platform. SYMPTOMS Trying to disable transparent hugepages. Made the following entries: /etc/grub.conf kernel /vmlinuz-2.6.32-642.3.1.el6.x86_64 ro root=/dev/mapper/vg_ho02db02-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg_ho02db02/lv_swap rd_LVM_LV=vg_ho02db02/lv_root KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet numa=off transparent_hugepage=never fnic.fnic_max_qdepth=256   /etc/rc.d/rc.local： if test −f /sys/kernel/mm/transparent_hugepage/enabled; then echo never > /sys/kernel/mm/transparent_hugepage/enabled fi if test −f /sys/kernel/mm/transparent_hugepage/defrag; then echo never > /sys/kernel/mm/transparent_hugepage/defrag fi Even though the changes have been made the system still shows hugepage is active CAUSE The ktune service enables transparent_hugepages by default for all profiles hence anytime a tuned profile is enabled at bootup or manually transparent huge pages gets re-enabled.   The below file states the cause of the hugepage getting enabled always even though it is set to never in grub.conf file /etc/tune-profiles/enterprise-storage/ktune.sh #!/bin/sh . /etc/tune-profiles/functions start() {   set_cpu_governor performance   set_transparent_hugepages always ---->>>> set transparent_hugepages always   disable_disk_barriers   multiply_disk_readahead 4   return 0 } stop() {   [ "$1" != "restart" ] && restore_cpu_governor   restore_transparent_hugepages   enable_disk_barriers   restore_disk_readahead   return 0 } process $@  SOLUTION #service tuned stop #chkconfig tuned off #service ktune stop #chkconfig ktune off Append transparent_hugepage=never to kernel command line in /boot/grub/grub.conf file /etc/grub.conf: ... kernel /vmlinuz-2.6.32-642.3.1.el6.x86_64 ro root=/dev/mapper/vg_ho02db02-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=vg_ho02db02/lv_swap rd_LVM_LV=vg_ho02db02/lv_root KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet numa=off transparent_hugepage=never  fnic.fnic_max_qdepth=256 ... Reboot the server and check if  /sys/kernel/mm/transparent_hugepage/enabled changed #cat /sys/kernel/mm/transparent_hugepage/enabled always madvise [never]