Messages in this thread | | | Date | Fri, 17 Aug 2012 09:29:28 +0800 | From | Alex Shi <> | Subject | Re: [discussion]sched: a rough proposal to enable power saving in scheduler |
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On 08/16/2012 10:01 PM, Arjan van de Ven wrote:
>> *Power policy*: >> >> So how is power policy different? As Peter says,'pack more than spread >> more'. > > this is ... a dubiously general statement. > > for good power, at least on Intel cpus, you want to spread. Parallelism is efficient. > > the only thing you do not want to do, is wake cpus up for > tasks that only run extremely briefly (think "100 usec" or less).
It's a very important and valuable info! Just want to know how you get this? From CS cost or cache/TLB refill cost?
> > so maybe the balance interval is slightly different, or more, you don't balance tasks that > historically ran only for brief periods > >
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