Messages in this thread | | | Date | Wed, 22 Aug 2012 12:35:08 +0100 | From | Matthew Garrett <> | Subject | Re: [discussion]sched: a rough proposal to enable power saving in scheduler |
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On Wed, Aug 22, 2012 at 11:10:13AM +0200, Ingo Molnar wrote: > > * Matthew Garrett <mjg59@srcf.ucam.org> wrote: > > > [...] > > > > Our power consumption is worse than under other operating > > systems is almost entirely because only one of our three GPU > > drivers implements any kind of useful power management. [...] > > ... and because our CPU frequency and C state selection logic is > doing pretty much the worst possible decisions (on x86 at > least).
You have figures showing that our C state residence is worse than, say, Windows? Because my own testing says that we're way better at that. Could we be better? Sure. Is it why we're worse? No.
> Regardless, you cannot possibly seriously suggest that because > there's even greater suckage elsewhere for some workloads we > should not even bother with improving the situation here.
I'm enthusiastic about improving the scheduler's behaviour. I'm unenthusiastic about putting in automatic hacks related to AC state.
-- Matthew Garrett | mjg59@srcf.ucam.org
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