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SubjectRe: [patch v2 1/2] sched: check for prev_cpu == this_cpu before calling wake_affine()
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On Thu, 2010-04-01 at 23:20 -0700, Mike Galbraith wrote:
> Do you have a compute load bouncing painfully which this patch cures?
>
> I have no strong objections, and the result is certainly easier on the
> eye. If I were making the decision, I'd want to see some numbers.

Mike, PeterZ,

Finally got sometime to get back to this and provide some data backing
up my patch under discussion. Here are my test results:

System is a two socket quad-core NHM-EP with SMT enabled and the
workload is specjbb2005.

Warehouses Throughput
tip tip+proposed-fix
1 35142 35027
2 73563 75977
3 105806 109836
4 133421 142490
5 152151 168888
6 164936 195392
7 184763 208155
8 192419 223846
PeterZ, I think the above clearly shows that we have a problem with the
current -tip code. Please consider the proposed patch (which can be
found at http://marc.info/?l=linux-kernel&m=127007936408754&w=2)

Mike, with the above data, can I have your Ack for the patch?

thanks,
suresh



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