RE: [PATCH V14 0/7] amd-pstate preferred core

[Meng, Li (Jassmine)]

[AMD Official Use Only - General]

Hi :
Thanks.
I will check this issue and fix it as soon as possible.

> -----Original Message-----
> From: Lucas Lee Jing Yi <lucasleeeeeeeee@xxxxxxxxx>
> Sent: Monday, February 19, 2024 12:11 AM
> To: rafael@xxxxxxxxxx
> Cc: Yuan, Perry <Perry.Yuan@xxxxxxx>; Du, Xiaojian
> <Xiaojian.Du@xxxxxxx>; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>; bp@xxxxxxxxx; Sharma, Deepak
> <Deepak.Sharma@xxxxxxx>; Meng, Li (Jassmine) <Li.Meng@xxxxxxx>;
> linux-acpi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-
> kselftest@xxxxxxxxxxxxxxx; linux-pm@xxxxxxxxxxxxxxx; Limonciello, Mario
> <Mario.Limonciello@xxxxxxx>; Fontenot, Nathan
> <Nathan.Fontenot@xxxxxxx>; oleksandr@xxxxxxxxxxxxxx;
> rafael.j.wysocki@xxxxxxxxx; Huang, Ray <Ray.Huang@xxxxxxx>; Huang,
> Shimmer <Shimmer.Huang@xxxxxxx>; skhan@xxxxxxxxxxxxxxxxxxx;
> viresh.kumar@xxxxxxxxxx; x86@xxxxxxxxxx
> Subject: Re: [PATCH V14 0/7] amd-pstate preferred core
>
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>
> Dear all,
> I have found an issue with the patchset when applying on 6.7, leading to a
> large degradation in performance.
>
> On my 7840HS on *STOCK* 6.7 highest_perf is reported as 196, not 166 as
> assumed in the patchset. Applying the patchset causes highest_perf to be
> misreported and hence a misreported maximum frequency as well, at
> 4.35GHz instead of 5.14GHz, leading to the degradation in performance.
> However, On my 5950X, highest_perf is indeed reported as 166 before and
> after applying the patchset.
>
> Hence, I propose the following patch (should be attached).
>
> I do apologize for any mistakes as I am new to this and this is my first email on
> the mailing list.
>
> Cheers!
> Lucas