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

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Message-ID: <1367315763.4616.93.camel@marge.simpson.net>
Date:	Tue, 30 Apr 2013 11:56:03 +0200
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Len Brown <lenb@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Alex Shi <alex.shi@...el.com>, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, pjt@...gle.com,
	namhyung@...nel.org, morten.rasmussen@....com,
	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, len.brown@...el.com,
	rafael.j.wysocki@...el.com, jkosina@...e.cz,
	clark.williams@...il.com, tony.luck@...el.com,
	keescook@...omium.org, mgorman@...e.de, riel@...hat.com,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [patch v7 0/21] sched: power aware scheduling

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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