linux-kernel - Re: [RFC/RFT][PATCH 0/4] cpufreq / sched: iowait boost in intel

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Date:   Wed, 07 Sep 2016 17:49:31 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Steve Muckle <steve.muckle@...aro.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <Juri.Lelli@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Doug Smythies <doug.smythies@...il.com>
Subject: Re: [RFC/RFT][PATCH 0/4] cpufreq / sched: iowait boost in
 intel_pstate and schedutil

On Thu, 2016-09-08 at 02:44 +0200, Rafael J. Wysocki wrote:
> On Wednesday, September 07, 2016 05:35:50 PM Srinivas Pandruvada
> wrote:
> > 
> > On Wed, 2016-09-07 at 17:22 -0700, Steve Muckle wrote:
> > > 
> > > On Sat, Sep 03, 2016 at 02:56:48AM +0200, Rafael J. Wysocki
> > > wrote:
> > > > 
> > > > 
> > > > Please let me know what you think and if you can run some
> > > > benchmarks you
> > > > care about and see if the changes make any difference (this way
> > > > or
> > > > another),
> > > > please do that and let me know what you've found.
> > > 
> > > LGTM (I just reviewed the first and last patch, skipping the
> > > intel_pstate ones).
> > > 
> > > I was unable to see a conclusive power regression in Android
> > > audio,
> > > video or
> > > idle usecases on my hikey 96board.
> > Did you see any performance regression on Android workloads?
> 
> That's with schedutil and IOwait boost.  Why would performance
> regress?
Some Android tests reach thermal limits and aggressive throttling
causes performance issues. 

Thanks,
Srinivas


> 
> Thanks,
> Rafael
>