linux-kernel - Re: [PATCH v2 0/8] Fix performance issue with ondemand governor

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Date:	Fri, 28 May 2010 11:30:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Rik van Riel <riel@...hat.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, davej@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH v2  0/8] Fix performance issue with ondemand governor


* Rik van Riel <riel@...hat.com> wrote:

> On 05/09/2010 01:49 PM, Ingo Molnar wrote:
> >* Arjan van de Ven<arjan@...radead.org>  wrote:
> >
> >>[Version 2 includes the acks/etc. Andrew: no changes from the patches that
> >>are in -mm]
> >>
> >>There have been various reports of the ondemand governor causing some
> >>serious performance issues, one of the latest ones from Andrew. There are
> >>several fundamental issues with ondemand (being worked on), but the report
> >>from Andrew can be fixed relatively easily.
> >>
> >>The fundamental issue is that ondemand will go to a (too) low CPU frequency
> >>for workloads that alternatingly disk and CPU bound...
> >
> >I've applied your series to sched/core and started testing it, thanks Arjan!
> 
> This code seems to help significantly with some workloads,
> allowing more systems to use the ondemand governor (and
> having fewer systems waste power by using the performance
> governor all the time).
> 
> It would be nice to see it in 2.6.35

Yeah, it's uptream now :-)

Cheers,

	Ingo
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