Messages in this thread | | | Date | Fri, 17 Aug 2012 11:44:03 -0700 | From | Arjan van de Ven <> | Subject | Re: [discussion]sched: a rough proposal to enable power saving in scheduler |
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On 8/17/2012 11:41 AM, Matthew Garrett wrote: > On Thu, Aug 16, 2012 at 07:01:25AM -0700, 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. > > Is this really true? In a two-socket system I'd have thought the benefit > of keeping socket 1 in package C3 outweighed the cost of keeping socket > 0 awake for slightly longer.
not on Intel
you can't enter package c3 either until every one is down. (e.g. memory controller must stay on etc etc)
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