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

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Message-Id: <1202895028.3027.27.camel@ymzhang>
Date:	Wed, 13 Feb 2008 17:30:28 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	vatsa@...ux.vnet.ibm.com
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: 2.6.25-rc1: volanoMark 45% regression

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

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