From: Ingo Molnar <mingo@elte.hu>
To: Al Boldi <a1426z@gawab.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Mike Galbraith <efault@gmx.de>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Keith Packard <keith.packard@intel.com>
Subject: Re: CFS review
Date: Wed, 29 Aug 2007 06:53:16 +0200 [thread overview]
Message-ID: <20070829045316.GA15064@elte.hu> (raw)
In-Reply-To: <200708290719.24422.a1426z@gawab.com>
* Al Boldi <a1426z@gawab.com> wrote:
> I have narrowed it down a bit to add_wait_runtime.
the scheduler is a red herring here. Could you "strace -ttt -TTT" one of
the glxgears instances (and send us the cfs-debug-info.sh output, with
CONFIG_SCHED_DEBUG=y and CONFIG_SCHEDSTATS=y as requested before) so
that we can have a closer look?
i reproduced something similar and there the stall is caused by 1+
second select() delays on the X client<->server socket. The scheduler
stats agree with that:
se.sleep_max : 2194711437
se.block_max : 0
se.exec_max : 977446
se.wait_max : 1912321
the scheduler itself had a worst-case scheduling delay of 1.9
milliseconds for that glxgears instance (which is perfectly good - in
fact - excellent interactivity) - but the task had a maximum sleep time
of 2.19 seconds. So the 'glitch' was not caused by the scheduler.
Ingo
next prev parent reply other threads:[~2007-08-29 4:53 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-11 10:44 CFS review Al Boldi
2007-08-12 4:17 ` Ingo Molnar
2007-08-12 15:27 ` Al Boldi
2007-08-12 15:52 ` Ingo Molnar
2007-08-12 19:43 ` Al Boldi
2007-08-21 10:58 ` Ingo Molnar
2007-08-21 22:27 ` Al Boldi
2007-08-24 13:45 ` Ingo Molnar
2007-08-25 22:27 ` Al Boldi
2007-08-25 23:15 ` Ingo Molnar
2007-08-26 16:27 ` Al Boldi
2007-08-26 16:39 ` Ingo Molnar
2007-08-27 4:06 ` Al Boldi
2007-08-27 10:53 ` Ingo Molnar
2007-08-27 14:46 ` Al Boldi
2007-08-27 20:41 ` Ingo Molnar
2007-08-28 4:37 ` Al Boldi
2007-08-28 5:05 ` Linus Torvalds
2007-08-28 5:23 ` Al Boldi
2007-08-28 7:28 ` Mike Galbraith
2007-08-28 7:36 ` Ingo Molnar
2007-08-28 16:34 ` Linus Torvalds
2007-08-28 16:44 ` Arjan van de Ven
2007-08-28 16:45 ` Ingo Molnar
2007-08-29 4:19 ` Al Boldi
2007-08-29 4:53 ` Ingo Molnar [this message]
2007-08-29 5:58 ` Al Boldi
2007-08-29 6:43 ` Ingo Molnar
2007-08-28 20:46 ` Valdis.Kletnieks
2007-08-28 7:43 ` Xavier Bestel
2007-08-28 8:02 ` Ingo Molnar
2007-08-28 19:19 ` Willy Tarreau
2007-08-28 19:55 ` Ingo Molnar
2007-08-29 4:18 ` Ingo Molnar
2007-08-29 4:29 ` Keith Packard
2007-08-29 4:46 ` Ingo Molnar
2007-08-29 7:57 ` Keith Packard
2007-08-29 8:04 ` Ingo Molnar
2007-08-29 8:53 ` Al Boldi
2007-08-29 15:57 ` Keith Packard
2007-08-29 19:56 ` Rene Herman
2007-08-30 7:05 ` Rene Herman
2007-08-30 7:20 ` Ingo Molnar
2007-08-31 6:46 ` Tilman Sauerbeck
2007-08-31 10:44 ` DRM and/or X trouble (was Re: CFS review) Rene Herman
2007-08-31 14:55 ` DRM and/or X trouble Satyam Sharma
2007-08-30 16:06 ` CFS review Chuck Ebbert
2007-08-30 16:48 ` Rene Herman
2007-08-29 4:40 ` Mike Galbraith
2007-08-29 3:42 ` Bill Davidsen
2007-08-29 3:37 ` Bill Davidsen
2007-08-29 3:45 ` Ingo Molnar
2007-08-29 13:11 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2007-07-10 8:31 -mm merge plans for 2.6.23 Andrew Morton
2007-07-11 12:43 ` x86 status was " Andi Kleen
2007-07-11 17:42 ` Ingo Molnar
2007-07-11 21:16 ` Andi Kleen
2007-07-11 21:46 ` Andrea Arcangeli
2007-07-11 22:09 ` Linus Torvalds
2007-07-13 2:23 ` Roman Zippel
2007-07-13 4:47 ` Mike Galbraith
2007-07-13 17:23 ` Roman Zippel
2007-07-14 5:04 ` Mike Galbraith
2007-08-01 3:41 ` CFS review Roman Zippel
2007-08-01 7:12 ` Ingo Molnar
2007-08-01 7:26 ` Mike Galbraith
2007-08-01 7:30 ` Ingo Molnar
2007-08-01 7:36 ` Mike Galbraith
2007-08-01 8:49 ` Mike Galbraith
2007-08-01 13:19 ` Roman Zippel
2007-08-01 15:07 ` Ingo Molnar
2007-08-01 17:10 ` Andi Kleen
2007-08-01 16:27 ` Linus Torvalds
2007-08-01 17:48 ` Andi Kleen
2007-08-01 17:50 ` Ingo Molnar
2007-08-01 18:01 ` Roman Zippel
2007-08-01 19:05 ` Ingo Molnar
2007-08-09 23:14 ` Roman Zippel
2007-08-10 5:49 ` Ingo Molnar
2007-08-10 13:52 ` Roman Zippel
2007-08-10 14:18 ` Ingo Molnar
2007-08-10 16:47 ` Mike Galbraith
2007-08-10 17:19 ` Roman Zippel
2007-08-10 16:54 ` Michael Chang
2007-08-10 17:25 ` Roman Zippel
2007-08-10 19:44 ` Ingo Molnar
2007-08-10 19:47 ` Willy Tarreau
2007-08-10 21:15 ` Roman Zippel
2007-08-10 21:36 ` Ingo Molnar
2007-08-10 22:50 ` Roman Zippel
2007-08-11 5:28 ` Willy Tarreau
2007-08-12 5:17 ` Ingo Molnar
2007-08-11 0:30 ` Ingo Molnar
2007-08-20 22:19 ` Roman Zippel
2007-08-21 7:33 ` Mike Galbraith
2007-08-21 8:35 ` Ingo Molnar
2007-08-21 11:54 ` Roman Zippel
2007-08-11 5:15 ` Willy Tarreau
2007-08-10 7:23 ` Mike Galbraith
2007-08-01 11:22 ` Ingo Molnar
2007-08-01 12:21 ` Roman Zippel
2007-08-01 12:23 ` Ingo Molnar
2007-08-01 13:59 ` Ingo Molnar
2007-08-01 14:04 ` Arjan van de Ven
2007-08-01 15:44 ` Roman Zippel
2007-08-01 17:41 ` Ingo Molnar
2007-08-01 18:14 ` Roman Zippel
2007-08-03 3:04 ` Matt Mackall
2007-08-03 3:57 ` Arjan van de Ven
2007-08-03 4:18 ` Willy Tarreau
2007-08-03 4:31 ` Arjan van de Ven
2007-08-03 4:53 ` Willy Tarreau
2007-08-03 4:38 ` Matt Mackall
2007-08-03 8:44 ` Ingo Molnar
2007-08-03 9:29 ` Andi Kleen
2007-08-01 11:37 ` Ingo Molnar
2007-08-01 12:27 ` Roman Zippel
2007-08-01 13:20 ` Andi Kleen
2007-08-01 13:33 ` Roman Zippel
2007-08-01 14:36 ` Ingo Molnar
2007-08-01 16:11 ` Andi Kleen
2007-08-02 2:17 ` Linus Torvalds
2007-08-02 4:57 ` Willy Tarreau
2007-08-02 10:43 ` Andi Kleen
2007-08-02 10:07 ` Willy Tarreau
2007-08-02 16:09 ` Ingo Molnar
2007-08-02 22:38 ` Roman Zippel
2007-08-02 19:16 ` Daniel Phillips
2007-08-02 23:23 ` Roman Zippel
2007-08-01 14:40 ` Ingo Molnar
2007-08-01 14:49 ` Peter Zijlstra
2007-08-02 17:36 ` Roman Zippel
2007-08-02 15:46 ` Ingo Molnar
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