linux-kernel - Re: [RFC PATCH 0/7] sched: cpufreq: Remove magic margins

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Message-ID: <20230908135939.GD24372@noisy.programming.kicks-ass.net>
Date:   Fri, 8 Sep 2023 15:59:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qais Yousef <qyousef@...alina.io>
Cc:     Ingo Molnar <mingo@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Lukasz Luba <lukasz.luba@....com>
Subject: Re: [RFC PATCH 0/7] sched: cpufreq: Remove magic margins

On Fri, Sep 08, 2023 at 02:33:36PM +0100, Qais Yousef wrote:

> > (even hardware has these things today, we get 0-255 values that do
> > 'something' uarch specific)
> 
> Ah, could I get some pointers please?

Intel HWP.EPP and AMD CPPC EPP I think.. both intel-pstate and
amd-pstate have EPP thingies.