linux-kernel - aim7 -30% regression in 2.6.24-rc1

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Message-Id: <1193391787.3019.174.camel@ymzhang>
Date:	Fri, 26 Oct 2007 17:43:07 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	mingo@...e.hu
Subject: aim7 -30% regression in 2.6.24-rc1

I tested 2.6.24-rc1 on my x86_64 machine which has 2 quad-core processors.

Comparing with 2.6.23, aim7 has about -30% regression. I did a bisect and found
patch http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b5869ce7f68b233ceb81465a7644be0d9a5f3dbb
caused the issue.

kbuild/SPECjbb2000/SPECjbb2005 also has big regressions. On my another
tigerton machine (4 quad-core processors), SPECjbb2005 has more than -40%
regression. I didn't do a bisect on such benchmark testing, but I suspect
the root cause is like aim7's.

-yanmin

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