Solved: Can't disable transparent hugepages in RHEL9

Posted on

To disable transparent hugepages, in RHEL up to 8, we add "transparent_hugepage=never" to the end of the GRUB_CMDLINE_LINUX line in /etc/default/grub, and run `grub2-mkconfig -o /boot/grub2/grub.cfg' (and also disable tuned, which would re-enable transparent hugepages). We just got a RHEL9 box and did the same (except there's no tuned). But /sys/kernel/mm/transparent_hugepage/enabled still showed "[always]" after reboot. Is there anything changed? What's the new way to disable it other than echo'ing "never" to this pseudo file after the server is rebooted?

[Update] Solved the problem by creating a tuned profile that sets transparent_hugepages=never.

(By the way, I've always wondered why Linux keeps setting transparent hugepages to true by default, even though the majority of Linux users in the world, based on various forum messages and web site articles, seem to prefer it otherwise. Why can't we have this feature already disabled right after OS installation?)

YH

Responses