linux-kernel - Re: high power consumption in recent kernels

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Date:	Thu, 08 Jul 2010 21:06:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Norbert Preining <preining@...ic.at>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	akpm <akpm@...ux-foundation.org>, Mike Galbraith <efault@....de>,
	tglx <tglx@...utronix.de>
Subject: Re: high power consumption in recent kernels

On Thu, 2010-07-08 at 17:59 +0200, Peter Zijlstra wrote:

> OK, so Arjan said the gain could come from tricking the idle governor
> into not using deeper C states. He also said he significantly cured said
> governor in .35.
> 
> Mike could you re-run your netperf tests that showed the 10% throughput
> gain? Hopefully the fixed governor will yield the same result and we can
> kill off this ratelimit thing.

FWIW, on my test-box, 35-rc4-tip, using ondemand:

with    nohz_ratelimit() : ~2119.54 MB/s
without nohz_ratelimit() : ~2353.03 MB/s

Seems to suggest we should simply kill the thing..
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