Messages in this thread | | | Date | Wed, 21 Sep 2022 21:51:51 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture |
| |
On Wed, Sep 21, 2022 at 07:15:07AM -0700, Dave Hansen wrote: > In the end, the delay is because of buggy, circa 2006 chipsets? So, we > use a CPU vendor specific check to approximate that the chipset is > recent and not affected by the bug? If so, is there no better way to > check for a newer chipset than this?
So I did some git archeology but that particular addition is in some conglomerate, glued-together patch from 2007 which added the cpuidle tree:
commit 4f86d3a8e297205780cca027e974fd5f81064780 Author: Len Brown <len.brown@intel.com> Date: Wed Oct 3 18:58:00 2007 -0400
cpuidle: consolidate 2.6.22 cpuidle branch into one patch
so the most precise check here should be to limit that dummy read to that Intel chipset which needed it. Damned if I knew how to figure out which...
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
| |