Re: [PATCH v3 05/22] sched: remove domain iterations infork/exec/wake

[li guang]

å 2013-01-15äç 10:34 +0800ïAlex Shiåéï
> On 01/14/2013 05:03 PM, li guang wrote:
> >>> > > This corner case may occur after "[PATCH v3 03/22] sched: fix
> >>> > > find_idlest_group mess logical" brought in the local sched_group bias,
> >>> > > and assume balancing runs on cpux2.
> >>> > > ideally,  find_idlest_group should find the real idlest(this case: sgy),
> >>> > > then, this patch is reasonable.
> >>> > > 
> >> > 
> >> > Sure. but seems it is a bit hard to go down the idlest group.
> >> > 
> >> > and the old logical is real cost too much, on my 2 socket NHM/SNB
> >> > server, hackbench can increase 2~5% performance. and no clean
> >> > performance on kbuild/aim7 etc.
> > what about remove local group bias?
> 
> 
> Any theory profit for non local group? Usually, bias toward local group
> will has cache locality profit.
> 

but the disadvantage is miss correct balance sometime,
if mostly like you said before it will bring in better performance,
that's fine, I have no strong statistic to do more profound analysis.


-- 
regards!
li guang

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