Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752845AbZLRKy0 (ORCPT ); Fri, 18 Dec 2009 05:54:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752740AbZLRKyZ (ORCPT ); Fri, 18 Dec 2009 05:54:25 -0500 Received: from fom01.emnet.dk ([89.249.14.84]:65186 "EHLO fom01.emnet.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752516AbZLRKyY (ORCPT ); Fri, 18 Dec 2009 05:54:24 -0500 X-AuditID: 59f90e54-b7bd7ae000001243-cb-4b2b5f5e088c Subject: Re: x264 benchmarks BFS vs CFS From: Kasper Sandberg To: Mike Galbraith Cc: Ingo Molnar , Jason Garrett-Glaser , Peter Zijlstra , LKML Mailinglist , Linus Torvalds In-Reply-To: <1261056647.10838.26.camel@marge.simson.net> References: <1261042383.14314.0.camel@localhost> <28f2fcbc0912170242r6d93dfb1j337558a829e21a75@mail.gmail.com> <20091217105316.GB26010@elte.hu> <1261047618.14314.6.camel@localhost> <1261056647.10838.26.camel@marge.simson.net> Content-Type: text/plain Date: Fri, 18 Dec 2009 11:54:18 +0100 Message-Id: <1261133658.14314.33.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.4.0 Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAARIa7Dg= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2739 Lines: 67 On Thu, 2009-12-17 at 14:30 +0100, Mike Galbraith wrote: > On Thu, 2009-12-17 at 12:00 +0100, Kasper Sandberg wrote: > > On Thu, 2009-12-17 at 11:53 +0100, Ingo Molnar wrote: > > > * Jason Garrett-Glaser wrote: > > > > > > > On Thu, Dec 17, 2009 at 1:33 AM, Kasper Sandberg 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. > > Fact is, it is working for a great number of people, the vast majority > of whom don't even know where the knobs are, much less what they do. but not as great as it could be :) > > > 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 > > Theatrics noted. > > > 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. > > Seems you haven't done much benchmarking. BFS has strengths as well as > weaknesses, all schedulers do. yeah, BFS just has more strengths and fewer weaknesses than CFS :) > > > not to mention that bfs does this whilst not loosing interactivity, > > something which cfs certainly cannot boast. > > Not true. I sent Con hard evidence of a severe problem area wrt > interactivity, and hard numbers showing other places where BFS needs > some work. But hey, if BFS blows your skirt up, use it and be happy. Theatrics noted. As for your point, well.. as far as i have heard, all you've come up with is COMPLETELY WORTHLESS use cases which nobody is ever EVAR going to do, and thus irellevant > > -Mike > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/