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SubjectPerformance regression of specjbb2005/aim7 with 2.6.29-rc1
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Comparing with 2.6.28's results, specjbb2005 has about 7% regression with 2.6.29-rc1
on my a couple of x86_64 machines. aim7 has about 1.7% regression.

Ming did a quick bisect with aim7 and located below patch.

commit 0a582440ff546e2c6610d1acec325e91b4efd313
Author: Mike Galbraith <efault@gmx.de>
Date: Fri Jan 2 12:16:42 2009 +0100

sched: fix sched_slice()

Impact: fix bad-interactivity buglet

Fix sched_slice() to emit a sane result whether a task is currently
enqueued or not.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Tested-by: Jayson King <dev@jaysonking.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


After we revert the patch, aim7 regression disappeared. specjbb2005 regression becomes
less than 1.5% on 8-core stokley and disappears on 16-core tigerton. I don't know what
causes the last 1.5% regression.

As tbench has about 5% improvement and oltp(mysql+sysbench) has 5% improvement, we also tested
to make sure such improvement isn't related to above patch. volanoMark's improvement is also not
related to the patch. So it seems safe to revert it.

yanmin



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