linux-kernel - Re: x264 benchmarks BFS vs CFS

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Message-Id: <1261133769.14314.35.camel@localhost>
Date:	Fri, 18 Dec 2009 11:56:09 +0100
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	tfjellstrom@...w.ca
Cc:	linux-kernel@...r.kernel.org
Subject: Re: x264 benchmarks BFS vs CFS

On Thu, 2009-12-17 at 14:22 -0700, Thomas Fjellstrom wrote:
> On Thu December 17 2009, Kasper Sandberg wrote:
> > On Thu, 2009-12-17 at 11:53 +0100, Ingo Molnar wrote:
> > > * Jason Garrett-Glaser <darkshikari@...il.com> wrote:
> > > > On Thu, Dec 17, 2009 at 1:33 AM, Kasper Sandberg <lkml@...anurb.dk> 
> wrote:
> > > > > well well :) nothing quite speaks out like graphs..
> > > > >
> > > > > http://doom10.org/index.php?topic=78.0
> > > > >
> > > > >
> > > > >
> > > > > regards,
> > > > > Kasper Sandberg
> > > >
> > > > Yeah, I sent this to Mike a bit ago.  Seems that .32 has basically
> > > > tied it--and given the strict thread-ordering expectations of x264,
> > > > you basically can't expect it to do any better, though I'm curious
> > > > what's responsible for the gap in "veryslow", even with SCHED_BATCH
> > > > enabled.
> > > >
> > > > The most odd case is that of "ultrafast", in which CFS immediately
> > > > ties BFS when we enable SCHED_BATCH.  We're doing some further
> > > > testing to see exactly
> > 
> > Thats kinda besides the point.
> > 
> > all these tunables and weirdness is _NEVER_ going to work for people.
> > 
> > now forgive me for being so blunt, but for a user, having to do
> > echo x264 > /proc/cfs/gief_me_performance_on_app
> > or
> > echo some_benchmark > x264 > /proc/cfs/gief_me_performance_on_app
> > 
> > just isnt usable, bfs matches, even exceeds cfs on all accounts, with
> > ZERO user tuning, so while cfs may be able to nearly match up with a ton
> > of application specific stuff, that just doesnt work for a normal user.
> > 
> > not to mention that bfs does this whilst not loosing interactivity,
> > something which cfs certainly cannot boast.
> > 
> > <snip>
> 
> Strange, I seem to recall that BFS needs you to run apps with some silly 
> schedtool program to get media apps to not skip while doing other tasks. (I 
> don't have to tweak CFS at all)
You recall incorrectly
> 
> > > Thanks,
> > >
> > > 	Ingo
> 
> 
> 

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