linux-kernel - Re: [PATCH v3 1/3] cpufreq: ondemand: Change the calculation of target frequency

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Message-ID: <1645236.hTWQPUhyIx@vostro.rjw.lan>
Date:	Fri, 14 Jun 2013 00:15:36 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Stratos Karafotis <stratosk@...aphore.gr>,
	Borislav Petkov <bp@...e.de>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-pm@...r.kernel.org,
	cpufreq@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] cpufreq: ondemand: Change the calculation of target frequency

On Thursday, June 13, 2013 11:40:08 PM Borislav Petkov wrote:
> On Fri, Jun 14, 2013 at 12:22:18AM +0300, Stratos Karafotis wrote:
> > Please let me share some more test results using aim9 benchmark suite:
> > https://docs.google.com/spreadsheet/ccc?key=0AnMfNYUV1k0ddDdGdlJyUHpqT2xGY1lBOEt2UEVnNlE&usp=sharing
> > 
> > Each test was running for 10sec. 
> > Total execution time with and without the patch was almost identical, which is
> > expected since the tests in aim9 run for a specific period.
> > The energy during the test run was increased by 0.43% with the patch.
> > The performance was increased by 1.25% (average) with this patch.
> 
> Not bad. However, exec_test and fork_test are kinda unexpected with such
> a high improvement percentage. Happen to have an explanation?
> 
> FWIW, if we don't find any serious perf/power regressions with
> this patch, I'd say it is worth applying even solely for the code
> simplification it brings.

May I take this as an ACK? ;-)

Well, that's my opinion too, actually.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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