Subject: Re: x264 benchmarks BFS vs CFS
From: Kasper Sandberg <lkml@metanurb.dk>
To: Mike Galbraith <efault@gmx.de>
Cc: Ingo Molnar <mingo@elte.hu>, Jason Garrett-Glaser <darkshikari@gmail.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       LKML Mailinglist <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>
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Date: Fri, 18 Dec 2009 11:57:36 +0100
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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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