linux-kernel - Re: [PATCH v4] x86, sched: Fix the AMD CPPC maximum perf on some specific generations

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Message-ID: <20210513104555.GC1621127@hr-amd>
Date:   Thu, 13 May 2021 18:45:55 +0800
From:   Huang Rui <ray.huang@....com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Alexander Monakov <amonakov@...ras.ru>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        Jason Bagavatsingham <jason.bagavatsingham@...il.com>,
        "Pierre-Loup A . Griffais" <pgriffais@...vesoftware.com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Borislav Petkov <bp@...e.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v4] x86, sched: Fix the AMD CPPC maximum perf on some
 specific generations

On Thu, May 13, 2021 at 06:39:08PM +0800, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...nel.org> wrote:
> 
> > No need to send v5, done!
> > 
> > I have a system that appears to be affected by this bug:
> > 
> >   kepler:~> lscpu | grep -i mhz
> >   CPU MHz:                         4000.000
> >   CPU max MHz:                     7140.6250
> >   CPU min MHz:                     2200.0000
> > 
> > So I should be able to confirm after a reboot.
> 
> 'CPU max Mhz' seems to be saner now:
> 
>   kepler:~> lscpu | grep -i mhz
> 
>   CPU MHz:                         2200.000
>   CPU max MHz:                     4917.9678
>   CPU min MHz:                     2200.0000
> 

Yes, happy to know this :-)

Thanks,
Ray