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Message-ID: <5661F548.1010506@hpe.com>
Date: Fri, 04 Dec 2015 15:19:20 -0500
From: Waiman Long <waiman.long@....com>
To: Mike Galbraith <umgwanakikbuti@...il.com>
CC: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org, Yuyang Du <yuyang.du@...el.com>,
Paul Turner <pjt@...gle.com>, Ben Segall <bsegall@...gle.com>,
Morten Rasmussen <morten.rasmussen@....com>,
Scott J Norton <scott.norton@....com>,
Douglas Hatch <doug.hatch@....com>
Subject: Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline
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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