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

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Message-ID: <20130613214007.GA32127@pd.tnic>
Date:	Thu, 13 Jun 2013 23:40:08 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Stratos Karafotis <stratosk@...aphore.gr>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, 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 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.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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