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AIM7 40% regression with 2.6.26-rc1

From:  "Zhang, Yanmin" <yanmin_zhang-AT-linux.intel.com>
To:  Matthew Wilcox <matthew-AT-wil.cx>
Subject:  AIM7 40% regression with 2.6.26-rc1
Date:  Tue, 06 May 2008 13:48:24 +0800
Message-ID:  <1210052904.3453.30.camel@ymzhang>
Cc:  LKML <linux-kernel-AT-vger.kernel.org>
Archive-link:  Article

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@wil.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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