On Thu, Dec 12, 2019 at 3:48 AM Peter Robinson <pbrobinson@xxxxxxxxx> wrote: > > Hey All. > > In digging through some pieces around CPU_IDLE I noticed that > NO_HZ_IDLE is explicitly disabled on x86_64 but not on all other > architectures. > > Doing a "git log --follow > configs/fedora/generic/x86/x86_64/CONFIG_NO_HZ_IDLE" it goes all the > way back to 2016 when we changed the way the configs were handled. > > The upstream kernel's opinion [1] on it is "Most of the time you want > to say Y here." so I'm wondering if there's a reason why we're > difference on x86_64 or is it just lost in the winds of time? > > Peter > > PS was digging around CPU_IDLE_GOV_TEO for those curious. > > [1] https://cateee.net/lkddb/web-lkddb/NO_HZ_IDLE.html commit 3836faf6e68495fc70316229a3540506f7ce4c98 Author: Kyle McMartin <kyle@xxxxxxxxxxxxxxxxx> Date: Wed Sep 17 13:10:12 2014 -0500 re-enable RCU_FAST_NO_HZ, enable NO_HZ_FULL on x86_64 - I also like to live dangerously. (Re-enable RCU_FAST_NO_HZ which has been off since April 2012. Also enable NO_HZ_FULL on x86_64.) _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx
