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

[Mike Galbraith]

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)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/