volanoMark regression with kernel 2.6.26-rc1

Zhang, Yanmin
2008-05-06T02:07:28Z

Comparing with 2.6.25, volanoMark has big regression with kernel 2.6.26-rc1.
It's about 50% on my 8-core stoakley, 16-core tigerton, and Itanium Montecito.

With bisect, I located below patch.

18d95a2832c1392a2d63227a7a6d433cb9f2037e is first bad commit
commit 18d95a2832c1392a2d63227a7a6d433cb9f2037e
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Sat Apr 19 19:45:00 2008 +0200

sched: fair-group: SMP-nice for group scheduling

Implement SMP nice support for the full group hierarchy.

If I reverse the patch with resolving some conflictions, volanoMark result could
be restored completely.

﻿
AIM7 (use tmpfs) also has ﻿more than 40% on my 8-core stoakley, 16-core tigerton,
and Itanium Montecito, but I verified that aim7 regression isn't caused by above
patch. I am doing new bisect to check aim7 now.

-yanmin