Re: [discussion]sched: a rough proposal to enable power saving inscheduler

From: Alex Shi
Date: Thu Aug 16 2012 - 21:30:53 EST


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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