linux-kernel - Re: [revert] mysql+oltp regression

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Message-ID: <20080811114324.GA23529@elte.hu>
Date:	Mon, 11 Aug 2008 13:43:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [revert] mysql+oltp regression


* Mike Galbraith <efault@....de> wrote:

> Greetings,
> 
> During regression testing of tip/sched/clock fixes, a regression in 
> low client count throughput turned up, which I traced this back to the 
> commit below.  I don't see anything wrong with it, but suspect that it 
> is preventing client/server pairs from staying together on the same 
> CPU as buddies, which mysql definitely likes quite a lot.  (I suspect 
> that this is the case, because I've seen this same performance curve 
> while tinkering with wakeup affinity and breaking it all to pieces;)
> 
> Changelog and test results below in case nobody sees a problem with 
> the commit itself.

i've applied your fix to tip/sched/urgent for the time being, thanks 
Mike for tracking it down. We can re-try newer iterations of Greg's 
patch in tip/sched/devel.

	Ingo
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