linux-kernel - Re: [PATCH -v4 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning

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Message-ID: <20130126120509.GD13445@gmail.com>
Date:	Sat, 26 Jan 2013 13:05:09 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	aquini@...hat.com, walken@...gle.com, eric.dumazet@...il.com,
	lwoodman@...hat.com, knoel@...hat.com, chegu_vinod@...com,
	raghavendra.kt@...ux.vnet.ibm.com, mingo@...hat.com
Subject: Re: [PATCH -v4 0/5] x86,smp: make ticket spinlock proportional
 backoff w/ auto tuning


* Mike Galbraith <bitbucket@...ine.de> wrote:

> On Fri, 2013-01-25 at 14:05 -0500, Rik van Riel wrote:
> 
> > The performance issue observed with AIM7 is still a mystery.
> 
> Hm.  AIM7 mystery _may_ be the same crud I see on a 4 node 40 
> core box. Stock scheduler knobs are too preempt happy, produce 
> unstable results. I twiddle them as below to stabilize 
> results.
> 
> I'm testing a load balancing series from Alex Shi with AIM7 
> and whatnot, added your series on top of it and retested.  
> What I see is improvement.

Since we want both series that's good news, agreed?

Thanks,

	Ingo
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