Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline

[Waiman Long]

On 12/03/2015 09:07 PM, Mike Galbraith wrote:
> On Thu, 2015-12-03 at 14:34 -0500, Waiman Long wrote:
> > On 12/02/2015 11:32 PM, Mike Galbraith wrote:
> > > Is that with the box booted skew_tick=1?
> > I haven't tried that kernel parameter. I will try it to see if it can
> > improve the situation. BTW, will there be other undesirable side effects
> > of using this other than the increased power consumption as said in the
> > kernel-parameters.txt file?
> Not that are known.  I kinda doubt you'd notice the power, but you
> should see a notable performance boost.  Who knows, with a big enough
> farm of busy big boxen, it may save power by needing fewer of them.
>
> 	-Mike

You are right. Use skew_tick=1 did improve performance and reduce the 
overhead of clock tick processing rather significantly. I think it 
should be the default for large SMP boxes. Thanks for the tip.

Cheers,
Longman
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