linux-kernel - Re: 2.6.25-rc1: volanoMark 45% regression

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Message-ID: <47B2BC2C.80100@linux.vnet.ibm.com>
Date:	Wed, 13 Feb 2008 15:15:16 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	vatsa@...ux.vnet.ibm.com, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: 2.6.25-rc1: volanoMark 45% regression

Zhang, Yanmin wrote:
> volanoMark has 45% regression with kernel 2.6.25-rc1 on my both 8-core
> stoakley and 16-core Tigerton.
> 
> I used bisect to locate below patch.
> 
> commit 58e2d4ca581167c2a079f4ee02be2f0bc52e8729
> Author: Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> Date:   Fri Jan 25 21:08:00 2008 +0100
> 
>     sched: group scheduling, change how cpu load is calculated
> 
> 
> 
> hackbench has about 30% regression on 16-core tigerton, but has about 10% improvement
> on 8-core stoakley.
> 
> In addition, tbench has about 6% regression on my 8-core stoakley and
> 25% regression on 16-core stoakley. Some other benchmarks, like netperf/aim7
> also have some regression. I will verify if they are all related to the
> patch.
> 
> -yanmin

Hi, Yamin,

Thanks for reporting the issue? Any chance we could getthe Oprofile output for
the run? The exact commandline and .config being used would also help.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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