linux-kernel - VolanoMark regression with 2.6.27-rc1

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Date:	Thu, 31 Jul 2008 11:20:25 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: VolanoMark regression with 2.6.27-rc1

Ingo,

volanoMark has regression with 2.6.27-rc1.
1) 70% on 16-core tigerton;
2) 18% on a new multi-core+HT mahcine;

I tried to use git bisect to locate the root cause, but git bisect always went
back to 2.6.26. Then, I used my mechanical bisect script linearly to locate below commit:

commit 82638844d9a8581bbf33201cc209a14876eca167
Merge: 9982fbf... 63cf13b...
Author: Ingo Molnar <mingo@...e.hu>
Date:   Wed Jul 16 00:29:07 2008 +0200

    Merge branch 'linus' into cpus4096

    Conflicts:

        arch/x86/xen/smp.c
        kernel/sched_rt.c
        net/iucv/iucv.c

    Signed-off-by: Ingo Molnar <mingo@...e.hu>

But if I use 'git show 82638844d9a8581bbf33201cc209a14876eca167', it looks like I could only
get a part of the patch. If I use web to acces the commit, I could get a big patch. As it's
a merge, what're commit numbers of the subpatches?

BTW, sysbench+mysql(oltp readonly) has about 15% regression, but git bisect looks crazy again.

-yanmin

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