linux-kernel - Re: [EXTERNAL] Re: [PATCH v2 2/2] cpufreq/amd-pstate: Fix the scaling_max_freq setting on shared memory CPPC systems

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Message-ID: <7f50abf9-e11a-4630-9970-f894c9caee52@amd.com>
Date: Thu, 5 Sep 2024 10:11:50 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: "Jones, Morgan" <Morgan.Jones@...sat.com>
Cc: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 David Arcari <darcari@...hat.com>,
 Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>,
 "rafael@...nel.org" <rafael@...nel.org>,
 "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
 "gautham.shenoy@....com" <gautham.shenoy@....com>,
 "perry.yuan@....com" <perry.yuan@....com>,
 "skhan@...uxfoundation.org" <skhan@...uxfoundation.org>,
 "li.meng@....com" <li.meng@....com>, "ray.huang@....com" <ray.huang@....com>
Subject: Re: [EXTERNAL] Re: [PATCH v2 2/2] cpufreq/amd-pstate: Fix the
 scaling_max_freq setting on shared memory CPPC systems

Hi Morgan,

Please apply these 3 commits:

commit 12753d71e8c5 ("ACPI: CPPC: Add helper to get the highest 
performance value")
commit ed429c686b79 ("cpufreq: amd-pstate: Enable amd-pstate preferred 
core support")
commit 3d291fe47fe1 ("cpufreq: amd-pstate: fix the highest frequency 
issue which limits performance")

The first two should help your system, the third will prevent 
introducing a regression on a different one.

Assuming that works we should ask @stable to pull all 3 in to fix this 
regression.

Thanks,

On 9/4/2024 08:57, Mario Limonciello wrote:
> Morgan,
> 
> I was referring specfiically to the version that landed in Linus' tree:
> https://git.kernel.org/torvalds/c/8164f7433264
> 
> But yeah it's effectively the same thing.  In any case, it's not the 
> solution.
> 
> We had some internal discussion and suspect this is due to missing 
> prefcore patches in 6.6 as that feature landed in 6.9.  We'll try to 
> reproduce this on a Rome system and come back with our findings and 
> suggestions what to do.
> 
> Thanks,
>