linux-kernel - Re: [PATCH v3 0/6] amd_pstate: Add guided autonomous mode support

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Date:   Wed, 1 Feb 2023 18:15:47 +0000
From:   Tor Vic <torvic9@...lbox.org>
To:     Wyes Karny <wyes.karny@....com>
Cc:     Rafael J Wysocki <rafael@...nel.org>,
        Huang Rui <ray.huang@....com>,
        Jonathan Corbet <corbet@....net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Mario.Limonciello@....com, Perry.Yuan@....com,
        Ananth Narayan <ananth.narayan@....com>,
        gautham.shenoy@....com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Bagas Sanjaya <bagasdotme@...il.com>, santosh.shukla@....com,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v3 0/6] amd_pstate: Add guided autonomous mode support



On 31.01.23 05:34, Wyes Karny wrote:
> Hi Tor Vic,
> 
> On 24 Jan 20:40, Tor Vic wrote:
> --------------------------------->8-----------------------------
>>
>> The "active" mode seems to be broken here on a Zen2 3900X running Linux 6.1.
>> Frequency remains stuck at minimum which is +-500 MHz.
> 
> I've fixed this in v4.
> 
>>
>> Some queries of the new /sys devices lead to I/O error:
>>
>>    # LANG=C cat /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_*
>>    166
>>    cat:
>> /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_lowest_nonlinear_freq:
>> Input/output error
>>    cat: /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_max_freq:
>> Input/output error
>>
> This issue I'm not able to reproduce. Is this issue seen with only EPP
> patches also?
> Could you please check if this issue still there with v4?

No, it's gone. Could have been a mismerge, I'm sorry.

> 
> Thanks,
> Wyes

Thank you!

> 
>> The "guided" mode seems to work fine with no stuck frequency, but also
>> produces I/O error on some /sys files.
>>
>> I haven't tested "passive".
>>
>> Cheers,
>>
>> Tor Vic