How to disable transparent hugepages (THP) on Red Hat Enterprise Linux 7
How to disable transparent hugepages (THP) on Red Hat Enterprise Linux 7
$ Solution 已验证 - 已更新2017年六月2日23:54 - English
环境
Red Hat Enterprise Linux 7
transparent hugepages (THP)
tuned
问题
How to disable transparent hugepages (THP) on Red Hat Enterprise Linux 7
Disabling transparent hugepages (THP) on Red Hat Enterprise Linux 7 is not taking effect.
决议
Follow the steps below
1.Add the "transparent_hugepage=never" kernel parameter option to the grub2 configuration file.
Append or change the "transparent_hugepage=never" kernel parameter
on the GRUB_CMDLINE_LINUX option in /etc/default/grub file. Only include the parameter once.
vim /etc/default/grub
GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap ... transparent_hugepage=never"
2.Rebuild the /boot/grub2/grub.cfg file by running the grub2-mkconfig -o command as follows:
Please ensure to take a backup of the existing /boot/grub2/grub.cfg before rebuilding.
On BIOS-based machines: ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
On UEFI-based machines: ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
3.Reboot the system and verify option has been added
Reboot the system
# shutdown -r now
Verify the parameter is set correctly
# cat /proc/cmdline
正确的,应该含 transparent_hugepage=never
If Transparent Huge Pages (THP) is still not disabled, continue and use one of the options below.
Option 1: (Recommended) create a customized tuned profile with disabled THP
With this resolution we will create a customized version of the currently running profile. The customized version will disable THP.
Find out which profile is active, create a copy.
In the following example we currently use the throughput-performance profile:
# tuned-adm active
Current active profile: throughput-performance
To create customized profile, create a new directory in /etc/tuned directory with desired profile name.
# mkdir /etc/tuned/myprofile-nothp
Then create a new tuned.conf file for myprofile-nothp, and insert the new tuning info:
# cat /etc/tuned/myprofile-nothp/tuned.conf
[main]
include= throughput-performance
[vm]
transparent_hugepages=never
Make the script executable:
# chmod +x /etc/tuned/myprofile-nothp/tuned.conf
Enable myprofile like so:
# tuned-adm profile myprofile-nothp
This change will immediately take effect and persist reboots.
To verify if THP are disabled or not, run below command:
# cat /sys/kernel/mm/transparent_hugepage/enabled
Option 2: (Alternative) Disable tuned services
This resolution will disable the tuned services.
# systemctl stop tuned
# systemctl disable tuned
或者
# tuned-adm off
Now add "transparent_hugepage=never" kernel parameter in grub2 configuration file as explained in steps 1-3 above.
Reboot the server for changes to take effect.
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