linux-kernel - volanoMark regression with kernel 2.6.26-rc1

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Message-Id: <1210039590.3453.18.camel@ymzhang>
Date:	Tue, 06 May 2008 10:06:30 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: volanoMark regression with kernel 2.6.26-rc1

Comparing with 2.6.25, volanoMark has big regression with kernel 2.6.26-rc1.
It's about 50% on my 8-core stoakley, 16-core tigerton, and Itanium Montecito.

With bisect, I located below patch.

18d95a2832c1392a2d63227a7a6d433cb9f2037e is first bad commit
commit 18d95a2832c1392a2d63227a7a6d433cb9f2037e
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date:   Sat Apr 19 19:45:00 2008 +0200

    sched: fair-group: SMP-nice for group scheduling

    Implement SMP nice support for the full group hierarchy.

If I reverse the patch with resolving some conflictions, volanoMark result could
be restored completely.

AIM7 (use tmpfs) also has more than 40% on my 8-core stoakley, 16-core tigerton,
and Itanium Montecito, but I verified that aim7 regression isn't caused by above
patch. I am doing new bisect to check aim7 now.

-yanmin

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