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aim7 -30% regression in 2.6.24-rc1

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From: Zhang, Yanmin <yanmin_zhang@...>
To: LKML <linux-kernel@...>
Cc: <mingo@...>
Subject: aim7 -30% regression in 2.6.24-rc1
Date: Friday, October 26, 2007 - 5:43 am

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=b5869c...
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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Messages in current thread:
aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Fri Oct 26, 5:43 am)
Re: aim7 -30% regression in 2.6.24-rc1, Ingo Molnar, (Fri Oct 26, 7:23 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Sun Oct 28, 10:22 pm)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Mon Oct 29, 5:37 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Mon Oct 29, 10:12 pm)
Re: aim7 -30% regression in 2.6.24-rc1, Ingo Molnar, (Tue Oct 30, 3:26 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Tue Oct 30, 4:36 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Wed Oct 31, 5:57 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Thu Nov 1, 5:34 am)
Re: aim7 -30% regression in 2.6.24-rc1, Cyrus Massoumi, (Thu Nov 1, 6:02 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Sun Nov 4, 9:24 pm)
Re: aim7 -30% regression in 2.6.24-rc1, Cyrus Massoumi, (Mon Nov 5, 5:37 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Wed Nov 7, 1:30 am)
Re: aim7 -30% regression in 2.6.24-rc1, Peter Zijlstra, (Wed Oct 31, 6:30 am)
Re: aim7 -30% regression in 2.6.24-rc1, Ingo Molnar, (Thu Nov 1, 4:58 am)
Re: aim7 -30% regression in 2.6.24-rc1, Peter Zijlstra, (Fri Oct 26, 5:53 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Sun Oct 28, 8:15 pm)