linux-kernel - Re: [RFC PATCH v3 0/6] sched/cpufreq: Make schedutil energy aware

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Message-ID: <20191014145315.GZ2311@hirez.programming.kicks-ass.net>
Date:   Mon, 14 Oct 2019 16:53:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Douglas RAILLARD <douglas.raillard@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        mingo@...hat.com, rjw@...ysocki.net, viresh.kumar@...aro.org,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, qperret@...rret.net,
        patrick.bellasi@...bug.net, dh.han@...sung.com
Subject: Re: [RFC PATCH v3 0/6] sched/cpufreq: Make schedutil energy aware

On Fri, Oct 11, 2019 at 02:44:54PM +0100, Douglas RAILLARD wrote:
> This has been ligthly tested with a rtapp task ramping from 10% to 75%
> utilisation on a big core. Results are improved by fast ramp-up
> EWMA [1], since it greatly reduces the oscillation in frequency at first
> idle when ramping up.
> 
> [1] [PATCH] sched/fair: util_est: fast ramp-up EWMA on utilization increases
>     Message-ID: <20190620150555.15717-1-patrick.bellasi@....com>
>     https://lore.kernel.org/lkml/20190620150555.15717-1-patrick.bellasi@arm.com/


I don't really see anything fundamentally weird here. Any actual numbers
or other means of quantifying the improvement these patches bring?