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

Meng, Li (Jassmine)
2024-02-19T01:03:01Z

[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@gmail.com>
> Sent: Monday, February 19, 2024 12:11 AM
> To: rafael@kernel.org
> Cc: Yuan, Perry <Perry.Yuan@amd.com>; Du, Xiaojian
> <Xiaojian.Du@amd.com>; Deucher, Alexander
> <Alexander.Deucher@amd.com>; bp@alien8.de; Sharma, Deepak
> <Deepak.Sharma@amd.com>; Meng, Li (Jassmine) <Li.Meng@amd.com>;
> linux-acpi@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> kselftest@vger.kernel.org; linux-pm@vger.kernel.org; Limonciello, Mario
> <Mario.Limonciello@amd.com>; Fontenot, Nathan
> <Nathan.Fontenot@amd.com>; oleksandr@natalenko.name;
> rafael.j.wysocki@intel.com; Huang, Ray <Ray.Huang@amd.com>; Huang,
> Shimmer <Shimmer.Huang@amd.com>; skhan@linuxfoundation.org;
> viresh.kumar@linaro.org; x86@kernel.org
> 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