From: Mike Galbraith <efault@gmx.de>
To: Con Kolivas <kernel@kolivas.org>
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 12:23:26 +0100 [thread overview]
Message-ID: <1173785006.8561.19.camel@Homer.simpson.net> (raw)
In-Reply-To: <200703132106.08878.kernel@kolivas.org>
On Tue, 2007-03-13 at 21:06 +1100, Con Kolivas wrote:
> On Tuesday 13 March 2007 20:39, Ingo Molnar wrote:
> > * Mike Galbraith <efault@gmx.de> wrote:
> > > I just retested with the encoders at nice 0, and the x/gforce combo is
> > > terrible. [...]
> >
> > ok. So nice levels had nothing to do with it - it's some other
> > regression somewhere. How does the vanilla scheduler cope with the
> > exactly same workload? I.e. could you describe the 'delta' difference in
> > behavior - because the delta is what we are interested in mostly, the
> > 'absolute' behavior alone is not sufficient. Something like:
> >
> > - on scheduler foo, under this workload, the CPU hogs steal 70% CPU
> > time and the resulting desktop experience is 'choppy': mouse pointer
> > is laggy and audio skips.
> >
> > - on scheduler bar, under this workload, the CPU hogs are at 40%
> > CPU time and the desktop experience is smooth.
> >
> > things like that - we really need to be able to see the delta.
>
> I only find a slowdown, no choppiness, no audio stutter (it would be extremely
> hard to make audio stutter in this design without i/o starvation or something
> along those lines). The number difference in cpu percentage I've already
> given on the previous email. The graphics driver does feature in this test
> case as well so others' mileage may vary. Mike said it was terrible.
My first test run with lame at nice 0 was truly horrid, but has _not_
repeated, so disregard that as an anomaly. For the most part, it is as
you say, things just get slower with load, any load. I definitely am
seeing lurchiness which is not present in mainline. No audio problems
with either kernel.
> > > [...] Funny thing though, x/gforce isn't as badly affected with a
> > > kernel build. Any build is quite noticable, but even at -j8, the
> > > effect doen't seem to be (very brief test warning applies) as bad as
> > > with only the two encoders running. That seems quite odd.
> >
> > likewise, how does the RSDL kernel build behavior compare to the vanilla
> > scheduler's behavior? (what happens in one that doesnt happen in the
> > other, etc.)
>
> Kernel compiles seem similar till the jobs get above about 3 where rsdl gets
> slower but still smooth. Audio is basically unaffected either way.
It seems to be a plain linear slowdown. The lurchiness I'm experiencing
varies in intensity, and is impossible to quantify. I see neither
lurchiness nor slowdown in mainline through -j8.
> Don't forget all the rest of the cases people have posted.
Absolutely, all test results count.
-Mike
next prev parent reply other threads:[~2007-03-13 11:23 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
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 [this message]
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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