linux-kernel - Re: x264 benchmarks BFS vs CFS

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Message-Id: <1261133856.14314.39.camel@localhost>
Date:	Fri, 18 Dec 2009 11:57:36 +0100
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Jason Garrett-Glaser <darkshikari@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML Mailinglist <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: x264 benchmarks BFS vs CFS

On Fri, 2009-12-18 at 08:30 +0100, Mike Galbraith wrote:
> On Fri, 2009-12-18 at 06:23 +0100, Ingo Molnar wrote:
> 
> > Having said that, we generally try to make things perform well without apps 
> > having to switch themselves to SCHED_BATCH. Mike, do you think we can make 
> > x264 perform as well (or nearly as well) under SCHED_OTHER as under 
> > SCHED_BATCH?
> 
> It's not bad as is, except for ultrafast mode.  START_DEBIT is the
> biggest problem there.  I don't think SCHED_OTHER will ever match
> SCHED_BATCH for this load, though I must say I haven't full-spectrum
> tested.  This load really wants RR scheduling, and wakeup preemption
> necessarily perturbs run order.
> 
> I'll probably piddle with it some more, it's an interesting load.
Yes, i must say, very interresting, its very complicated and... oh wait,
its just encoding a movie!
> 
> 	-Mike
> 
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