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

[Matthew Garrett]

On Wed, Aug 22, 2012 at 11:10:13AM +0200, Ingo Molnar wrote:
> 
> * Matthew Garrett <mjg59@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx
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