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SubjectRe: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
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On 9/21/2022 14:51, Borislav Petkov wrote:
> 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...
>

Functionally most Intel platforms use intel_idle though these days
though, right?

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