From: Con Kolivas <kernel@kolivas.org>
To: Mike Galbraith <efault@gmx.de>
Cc: Ingo Molnar <mingo@elte.hu>,
linux kernel mailing list <linux-kernel@vger.kernel.org>,
ck list <ck@vds.kolivas.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2
Date: Tue, 13 Mar 2007 07:38:18 +1100 [thread overview]
Message-ID: <200703130738.19034.kernel@kolivas.org> (raw)
In-Reply-To: <1173730314.6431.30.camel@Homer.simpson.net>
On Tuesday 13 March 2007 07:11, Mike Galbraith wrote:
> On Tue, 2007-03-13 at 05:49 +1100, Con Kolivas wrote:
> > On Tuesday 13 March 2007 01:34, Mike Galbraith wrote:
> > > On Mon, 2007-03-12 at 22:23 +1100, Con Kolivas wrote:
> > > > Mike the cpu is being proportioned out perfectly according to
> > > > fairness as I mentioned in the prior email, yet X is getting the
> > > > lower latency scheduling. I'm not sure within the bounds of fairness
> > > > what more would you have happen to your liking with this test case?
> > >
> > > It has been said that "perfection is the enemy of good". The two
> > > interactive tasks receiving 40% cpu while two niced background jobs
> > > receive 60% may well be perfect, but it's damn sure not good.
> >
> > Again I think your test is not a valid testcase. Why use two threads for
> > your encoding with one cpu? Is that what other dedicated desktop OSs
> > would do?
>
> The testcase is perfectly valid. My buddies box has two full cores, so
> we used two encoders such that whatever bandwidth is not being actively
> consumed by more important things gets translated into mp3 encoding.
>
> How would you go about ensuring that there won't be any cycles wasted?
>
> _My_ box has 1 core that if fully utilized translates to 1.2 cores.. or
> whatever, depending on the phase of the moon. But no matter, logical vs
> physical cpu argument is pure hand-waving. What really matters here is
> the bottom line: your fair scheduler ignores the very real requirements
> of interactivity.
Definitely not. It does not give unfair cpu towards interactive tasks. That's
a very different argument.
> > And let's not lose sight of things with this one testcase.
> >
> > RSDL fixes
> > - every starvation case
> > - all fairness isssues
> > - is better 95% of the time on the desktop
>
> I don't know where you got that 95% number from. For the most part, the
> existing scheduler does well. If it sucked 95% of the time, it would
> have been shredded a long time ago.
Check the number of feedback reports. I don't feel petty enough to count them
personally to give you an accuracte percentage.
> > If we fix 95% of the desktop and worsen 5% is that bad given how much
> > else we've gained in the process?
>
> Killing the known corner case starvation scenarios is wonderful, but
> let's not just pretend that interactive tasks don't have any special
> requirements.
Now you're really making a stretch of things. Where on earth did I say that
interactive tasks don't have special requirements? It's a fundamental feature
of this scheduler that I go to great pains to get them as low latency as
possible and their fair share of cpu despite having a completely fair cpu
distribution.
> -Mike
--
-ck
next prev parent reply other threads:[~2007-03-12 20:39 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-11 3:57 [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2 Con Kolivas
2007-03-11 11:39 ` Mike Galbraith
2007-03-11 11:48 ` Con Kolivas
2007-03-11 12:08 ` Mike Galbraith
2007-03-11 12:10 ` Ingo Molnar
2007-03-11 12:20 ` Mike Galbraith
2007-03-11 21:18 ` Mike Galbraith
2007-03-12 7:22 ` Mike Galbraith
2007-03-12 7:48 ` Con Kolivas
2007-03-12 8:29 ` Con Kolivas
2007-03-12 8:55 ` Mike Galbraith
2007-03-12 9:22 ` Con Kolivas
2007-03-12 9:38 ` Mike Galbraith
2007-03-12 10:27 ` Con Kolivas
2007-03-12 10:57 ` Mike Galbraith
2007-03-12 11:08 ` Ingo Molnar
2007-03-12 11:23 ` Con Kolivas
2007-03-12 13:48 ` Theodore Tso
2007-03-12 18:09 ` Con Kolivas
2007-03-12 14:34 ` Mike Galbraith
2007-03-12 15:26 ` Linus Torvalds
2007-03-12 18:10 ` Con Kolivas
2007-03-12 19:36 ` Peter Zijlstra
2007-03-12 20:36 ` Mike Galbraith
2007-03-13 4:17 ` Kyle Moffett
2007-03-13 8:09 ` Ingo Molnar
2007-03-12 18:49 ` Con Kolivas
2007-03-12 19:06 ` Xavier Bestel
2007-03-13 17:21 ` Valdis.Kletnieks
2007-03-12 20:11 ` Mike Galbraith
2007-03-12 20:38 ` Con Kolivas [this message]
2007-03-12 20:45 ` Mike Galbraith
2007-03-12 22:51 ` Con Kolivas
2007-03-13 5:10 ` Mike Galbraith
2007-03-13 5:53 ` Con Kolivas
2007-03-13 6:08 ` [ck] " Rodney Gordon II
2007-03-13 6:17 ` Mike Galbraith
2007-03-13 7:53 ` Mike Galbraith
2007-03-13 8:22 ` Ingo Molnar
2007-03-13 8:18 ` Ingo Molnar
2007-03-13 8:22 ` Mike Galbraith
2007-03-13 9:21 ` Con Kolivas
2007-03-13 9:29 ` Ingo Molnar
2007-03-13 9:41 ` Con Kolivas
2007-03-13 10:50 ` Bill Huey
2007-03-13 9:31 ` [ck] " Con Kolivas
2007-03-13 10:24 ` Xavier Bestel
2007-03-13 23:19 ` Sanjoy Mahajan
2007-03-13 9:33 ` Mike Galbraith
2007-03-13 9:39 ` Ingo Molnar
2007-03-13 10:06 ` Con Kolivas
2007-03-13 11:23 ` Mike Galbraith
2007-03-13 11:41 ` Serge Belyshev
2007-03-13 11:46 ` Mike Galbraith
2007-03-13 15:36 ` John Stoffel
2007-03-13 14:17 ` Matt Mackall
2007-03-13 15:15 ` David Schwartz
2007-03-13 17:59 ` Jeremy Fitzhardinge
2007-03-13 19:58 ` David Schwartz
2007-03-13 20:10 ` Jeremy Fitzhardinge
2007-03-13 20:35 ` Bill Huey
2007-03-13 20:27 ` Bill Huey
2007-03-16 16:42 ` Pavel Machek
2007-03-12 23:43 ` David Lang
2007-03-13 2:23 ` Lee Revell
2007-03-13 6:00 ` David Lang
2007-03-12 21:34 ` [ck] " jos poortvliet
2007-03-12 21:38 ` michael chang
2007-03-13 0:09 ` Thibaut VARENE
2007-03-13 6:08 ` Mike Galbraith
2007-03-13 6:16 ` Con Kolivas
2007-03-13 6:30 ` Mike Galbraith
2007-03-12 20:42 ` Peter Zijlstra
2007-03-12 21:05 ` Serge Belyshev
2007-03-12 21:41 ` Mike Galbraith
2007-03-12 11:25 ` Mike Galbraith
2007-03-12 9:38 ` Xavier Bestel
2007-03-12 10:34 ` Con Kolivas
2007-03-12 16:38 ` Kasper Sandberg
2007-03-14 2:25 ` Valdis.Kletnieks
2007-03-14 3:25 ` Gabriel C
2007-03-14 9:44 ` Xavier Bestel
2007-03-12 8:44 ` Mike Galbraith
2007-03-11 14:32 ` Gene Heskett
2007-03-12 6:58 ` Radoslaw Szkodzinski
2007-03-12 11:16 ` Gene Heskett
2007-03-12 11:49 ` Gene Heskett
2007-03-12 11:58 ` Con Kolivas
2007-03-12 16:38 ` Gene Heskett
2007-03-12 18:34 ` Gene Heskett
2007-03-12 19:53 Al Boldi
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