From: Ingo Molnar <mingo@elte.hu>
To: William Weston <weston@sysex.net>
Cc: "K.R. Foley" <kr@cybsft.com>,
linux-kernel@vger.kernel.org,
"Eugeny S. Mints" <emints@ru.mvista.com>,
Daniel Walker <dwalker@mvista.com>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00
Date: Wed, 22 Jun 2005 12:08:02 +0200 [thread overview]
Message-ID: <20050622100802.GA9207@elte.hu> (raw)
In-Reply-To: <20050622082450.GA19957@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> * William Weston <weston@sysex.net> wrote:
>
> > Attached are two typical traces and the .config from my Xeon/HT box,
> > currently running -50-06 with a normal desktop workload (X, wmaker,
> > ten dockapps, several xterms, and firefox).
>
> the second trace seems to be a cross-CPU wakeup bug. It's not
> completely clear from the trace what happened - but we measured the
> latency of a task (wmcube-3191), where the wakeup happened on CPU#0
> and wmcube-3191 was queued to CPU#1 which was idle at that time. The
> bug is that it wasnt until timestamp 306us that this actually happened
> - and CPU#1 was just idling around in default_idle() for no good
> reason. CPU#1 should have run wmcube-3191 at around timestamp 13us.
ok, managed to reproduce it on a HT box, and it turned out to be a bug
in the SMT scheduler: the dependent sleeper logic incorrectly delayed
high-prio tasks, causing these latencies. I fixed it in the -50-10
kernel - could you redo your tests with that kernel (or later versions)?
Ingo
next prev parent reply other threads:[~2005-06-22 10:14 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-08 11:28 [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 Ingo Molnar
2005-06-08 14:18 ` Michal Schmidt
2005-06-08 14:40 ` Keith Owens
2005-06-08 14:41 ` Paulo Marques
2005-06-08 15:04 ` Michal Schmidt
2005-06-08 15:23 ` Keith Owens
2005-06-08 15:56 ` Paulo Marques
2005-06-08 14:32 ` Michal Schmidt
2005-06-08 15:48 ` K.R. Foley
2005-06-08 16:08 ` K.R. Foley
2005-06-08 16:26 ` K.R. Foley
2005-06-08 17:26 ` K.R. Foley
2005-06-08 19:18 ` Ingo Molnar
2005-06-09 11:39 ` Ingo Molnar
2005-06-10 13:34 ` K.R. Foley
2005-06-09 8:47 ` Serge Noiraud
2005-06-09 11:55 ` Ingo Molnar
2005-06-09 15:12 ` Serge Noiraud
2005-06-09 16:34 ` Daniel Walker
2005-06-13 8:53 ` Serge Noiraud
2005-06-13 9:07 ` Ingo Molnar
2005-06-08 17:51 ` Michal Schmidt
2005-06-09 11:45 ` Ingo Molnar
2005-06-09 12:09 ` Michal Schmidt
2005-06-09 12:13 ` Ingo Molnar
2005-06-09 12:48 ` Michal Schmidt
2005-06-10 8:56 ` Esben Nielsen
2005-06-08 19:58 ` Daniel Walker
2005-06-09 21:24 ` Michal Schmidt
2005-06-09 21:34 ` Michal Schmidt
2005-06-11 7:32 ` Ingo Molnar
2005-06-11 8:10 ` Ingo Molnar
2005-06-11 16:35 ` Peter Zijlstra
2005-06-11 18:48 ` Ingo Molnar
2005-06-11 21:14 ` Peter Zijlstra
2005-06-12 1:40 ` Gene Heskett
2005-06-12 6:49 ` Ingo Molnar
2005-06-12 9:02 ` Gene Heskett
2005-06-12 10:35 ` Ingo Molnar
2005-06-12 13:40 ` Gene Heskett
2005-06-12 13:49 ` Ingo Molnar
2005-06-12 14:23 ` Gene Heskett
2005-06-13 2:11 ` Gene Heskett
2005-06-13 6:09 ` Ingo Molnar
2005-06-13 8:37 ` Gene Heskett
2005-06-14 18:24 ` K.R. Foley
2005-06-14 18:54 ` Ingo Molnar
2005-06-14 22:45 ` Daniel Walker
2005-06-15 6:12 ` Ingo Molnar
2005-06-15 9:13 ` Esben Nielsen
2005-06-14 20:37 ` Paul E. McKenney
2005-06-16 3:51 ` K.R. Foley
2005-06-16 7:29 ` Ingo Molnar
2005-06-16 11:22 ` K.R. Foley
2005-06-16 17:32 ` Ingo Molnar
2005-06-16 17:59 ` K.R. Foley
2005-06-16 20:37 ` K.R. Foley
2005-06-17 11:08 ` Ingo Molnar
2005-06-16 20:43 ` Ingo Molnar
2005-06-17 2:06 ` Gene Heskett
2005-06-17 4:53 ` Gene Heskett
2005-06-17 11:18 ` Ingo Molnar
2005-06-17 14:12 ` K.R. Foley
2005-06-17 15:33 ` K.R. Foley
2005-06-17 19:28 ` William Weston
2005-06-17 21:30 ` William Weston
2005-06-18 12:28 ` Ingo Molnar
2005-06-21 1:18 ` William Weston
2005-06-23 2:05 ` William Weston
2005-06-23 7:56 ` Ingo Molnar
2005-06-23 13:45 ` Gene Heskett
2005-06-21 13:10 ` Ingo Molnar
2005-06-21 19:08 ` William Weston
2005-06-21 20:17 ` Benjamin LaHaise
2005-06-21 20:37 ` William Weston
2005-06-21 20:48 ` Benjamin LaHaise
2005-06-22 2:42 ` Gene Heskett
2005-06-22 7:40 ` Ingo Molnar
2005-06-22 13:27 ` Gene Heskett
2005-06-22 13:51 ` Gene Heskett
2005-06-22 14:08 ` Gene Heskett
2005-06-25 4:41 ` Ingo Molnar
2005-06-25 4:47 ` Ingo Molnar
2005-06-25 5:39 ` Gene Heskett
2005-06-25 7:26 ` Gene Heskett
2005-06-25 9:12 ` Ingo Molnar
2005-06-25 13:19 ` Gene Heskett
2005-06-25 14:39 ` Gene Heskett
2005-06-27 19:01 ` Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24 Chuck Harding
2005-06-27 19:42 ` Chuck Harding
2005-06-27 21:08 ` Gene Heskett
2005-06-27 20:09 ` Daniel Walker
2005-06-27 20:28 ` Chuck Harding
2005-06-28 0:50 ` Daniel Walker
2005-06-28 7:53 ` Steven Rostedt
2005-06-28 8:18 ` Ingo Molnar
2005-06-28 8:34 ` Steven Rostedt
2005-06-28 9:12 ` Ingo Molnar
2005-06-28 15:26 ` Michal Schmidt
2005-06-28 15:31 ` Ingo Molnar
2005-06-28 18:50 ` Chuck Harding
2005-06-28 22:16 ` Chuck Harding
2005-06-29 0:32 ` Chuck Harding
2005-06-28 15:54 ` Daniel Walker
2005-06-21 13:12 ` [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 Ingo Molnar
[not found] ` <Pine.LNX.4.58.0506211228210.16701@echo.lysdexia.org>
2005-06-22 8:03 ` Ingo Molnar
2005-06-22 8:24 ` Ingo Molnar
2005-06-22 10:08 ` Ingo Molnar [this message]
2005-06-22 21:53 ` William Weston
2005-06-22 22:00 ` Ingo Molnar
2005-06-22 23:06 ` William Weston
2005-06-23 0:10 ` Ingo Molnar
2005-06-23 22:11 ` William Weston
2005-06-24 1:46 ` William Weston
2005-06-24 7:06 ` Ingo Molnar
2005-06-24 22:31 ` William Weston
2005-06-25 4:14 ` Ingo Molnar
2005-06-27 4:21 ` William Weston
2005-06-27 8:15 ` Ingo Molnar
2005-06-28 3:32 ` William Weston
2005-06-28 8:10 ` Ingo Molnar
2005-06-28 11:15 ` Ingo Molnar
[not found] ` <Pine.LNX.4.58.0506281745040.10406@echo.lysdexia.org>
2005-06-29 12:54 ` Ingo Molnar
2005-06-30 0:29 ` William Weston
2005-06-27 5:43 ` Gene Heskett
2005-06-27 8:17 ` Ingo Molnar
2005-06-27 17:29 ` Gene Heskett
2005-06-27 19:54 ` Ingo Molnar
2005-06-27 21:17 ` Gene Heskett
2005-06-28 8:28 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2005-06-08 14:02 kus Kusche Klaus
2005-06-08 14:14 ` Thomas Gleixner
2005-06-08 15:49 ` Daniel Walker
2005-06-08 15:50 ` Ingo Molnar
2005-06-08 16:23 ` Thomas Gleixner
2005-06-08 17:29 ` Daniel Walker
2005-06-08 19:24 ` Ingo Molnar
2005-06-12 9:29 Zoltan Boszormenyi
2005-06-12 10:39 ` Ingo Molnar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20050622100802.GA9207@elte.hu \
--to=mingo@elte.hu \
--cc=dwalker@mvista.com \
--cc=emints@ru.mvista.com \
--cc=kr@cybsft.com \
--cc=linux-kernel@vger.kernel.org \
--cc=weston@sysex.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.