linux-kernel - AIM7 40% regression with 2.6.26-rc1

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Date:	Tue, 06 May 2008 13:48:24 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: AIM7 40% regression with 2.6.26-rc1

Comparing with kernel 2.6.25, AIM7 (use tmpfs) has more than 40% with 2.6.26-rc1
on my 8-core stoakley, 16-core tigerton, and Itanium Montecito. Bisect located
below patch.

64ac24e738823161693bf791f87adc802cf529ff is first bad commit
commit 64ac24e738823161693bf791f87adc802cf529ff
Author: Matthew Wilcox <matthew@....cx>
Date:   Fri Mar 7 21:55:58 2008 -0500

    Generic semaphore implementation

After I manually reverted the patch against 2.6.26-rc1 while fixing lots of
conflictions/errors, aim7 regression became less than 2%.

-yanmin

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