Re: volanoMark regression with kernel 2.6.26-rc1

[Andrew Morton]

On Tue, 06 May 2008 10:06:30 +0800 "Zhang, Yanmin" <yanmin_zhang@xxxxxxxxxxxxxxx> wrote:

> 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@xxxxxxxxx>
> Date:   Sat Apr 19 19:45:00 2008 +0200

The merge window strikes again?

> 
>     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.
> 

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