Re: [patch v7 0/21] sched: power aware scheduling

From: Mike Galbraith
Date: Tue Apr 30 2013 - 05:56:45 EST

On Tue, 2013-04-30 at 11:49 +0200, Mike Galbraith wrote:
> On Tue, 2013-04-30 at 11:35 +0200, Mike Galbraith wrote:
> > On Tue, 2013-04-30 at 10:41 +0200, Ingo Molnar wrote:
> > > Which are the workloads where 'powersaving' mode hurts workload
> > > performance measurably?
> >
> > Well, it'll lose throughput any time there's parallel execution
> > potential but it's serialized instead.. using average will inevitably
> > stack tasks sometimes, but that's its goal. Hackbench shows it.
> (but that consolidation can be a winner too, and I bet a nickle it would
> be for a socket sized pgbench run)

(belay that, was thinking of keeping all tasks on a single node, but
it'll likely stack the whole thing on a CPU or two, if so, it'll hurt)

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