linux-kernel - Re: [RFC PATCHC 0/3] sched/idle : find the idlest cpu with cpuidle info

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Message-ID: <533E6A7A.4070400@linaro.org>
Date:	Fri, 04 Apr 2014 10:16:58 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Len Brown <lenb@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, nicolas.pitre@...aro.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	alex.shi@...aro.org, vincent.guittot@...aro.org,
	morten.rasmussen@....com
Subject: Re: [RFC PATCHC 0/3] sched/idle : find the idlest cpu with cpuidle
 info

On 04/04/2014 08:29 AM, Len Brown wrote:
> Hi Daniel,
>
> Interesting idea.
>
> The benefit of this patch is to reduce power.
> Have you been able to measure a power reduction, via power meter, or
> via built-in RAPL power meter?
> (turbostat will show RAPL watts, or if you have constant quantity of
> work, use turbostat -J)

Hi Len,

thanks for looking the patches.

I will tweak, respin the patchset and do some more measurements.

I don't have a power meter but may be the RAPL could help to test on x86.

Thanks
   -- Daniel


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