How to permanently turn off THP (transparent hugepage)
I created a droplet with centos 7. In order to let MMS (mms.mongodb.com) manage my mongodb without warning about THP, I did following:
edit /etc/default/grub to add transparent_hugepage=never to GRUB_CMDLINE_LINUX_DEFAULT
run grub2-mkconfig
systemctl stop tuned
systemctl disable tuned
reboot
after reboot I check it with cat /sys/kernel/mm/transparent_hugepage/enabled. Still get [always]. Seems some other services enable it.
How can I permanently disable THP? I also want to disable THP defrag
I don't want to do it in rc.local as it runs after other services including mongod which will be installed later by MMS.
I don't want to say goodbye to DO and return to AWS
Grub in this environment is very misleading. DigitalOcean is using a virtualization system that does not boot the same way a physical machine boots. You can not alter/change any of the kernel boot options in the virtualization environment DigitalOcean has.
As you are running CentOS 7, you could create a systemd script to disable it earlier during the boot process prior to you other services starting.
Interested in an answer to this as redis also complains about THP. https://www.digitalocean.com/company/blog/transparent-huge-pages-and-alternative-memory-allocators/ shows DO itself is having issues with it. Is the solution to run the solution in the link every time at startup?