From: Ingo Molnar <mingo@elte.hu>
To: "Damien Wyart" <damien.wyart@free.fr>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Mike Galbraith" <efault@gmx.de>,
"Frédéric Weisbecker" <fweisbec@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Kernel Testers List <kernel-testers@vger.kernel.org>
Subject: Re: [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1
Date: Sun, 15 Feb 2009 12:01:04 +0100 [thread overview]
Message-ID: <20090215110104.GB31351@elte.hu> (raw)
In-Reply-To: <20090215103445.GA2335@localhost.localdomain>
* Damien Wyart <damien.wyart@free.fr> wrote:
> So I followed the tracing steps in the tutorial (with the 1 sec sleep),
> which gave me this:
> http://damien.wyart.free.fr/trace_2.6.29-rc5_ksoftirqd_prob.txt.gz
thanks. There's definitely some weirdness visible in the trace,
for example:
0) gpm-1879 => ksoftir-4
------------------------------------------
0) 0.964 us | finish_task_switch();
0) ! 1768184 us | }
0) | do_softirq() {
0) | __do_softirq() {
0) | rcu_process_callbacks() {
the 1.7 seconds 'overhead' there must be a fluke - you'd notice it if
ksoftirqd _really_ took that much time to execute.
One possibility for these symptoms would be broken scheduler timestamps.
Could you enable absolute timestamp printing via:
echo funcgraph-abstime > trace_options
Also, my guess is that if you boot via idle=poll, the symptoms go away.
This would strengthen the suspicion that it's scheduler-clock troubles.
Ingo
next prev parent reply other threads:[~2009-02-15 11:01 UTC|newest]
Thread overview: 131+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-14 20:35 2.6.29-rc5: Reported regressions from 2.6.28 Rafael J. Wysocki
2009-02-14 20:35 ` [Bug #12414] iwl4965 cannot use "ap auto" on latest 2.6.28/29? Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12444] X hangs following switch from radeonfb console - Bisected Rafael J. Wysocki
2009-02-16 17:52 ` Graham Murray
2009-02-16 21:52 ` Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12418] Repeated ioctl(4, 0x40046445, ..) loop in glxgears Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12490] ath5k related kernel panic in 2.6.29-rc1 Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12419] possible circular locking dependency on i915 dma Rafael J. Wysocki
2009-02-16 3:50 ` Wang Chen
2009-02-14 20:38 ` [Bug #12497] new barrier warnings in 2.6.29-rc1 Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12496] swsusp cannot find resume device (sometimes) Rafael J. Wysocki
2009-02-15 0:05 ` Arjan van de Ven
2009-02-15 14:23 ` Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12491] i915 lockdep warning Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12494] Sony backlight regression from 2.6.28 to 29-rc Rafael J. Wysocki
2009-02-17 10:51 ` Norbert Preining
2009-02-14 20:38 ` [Bug #12499] Problem with using bluetooth adaper connected to usb port Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12501] build bug in eeepc-laptop.c Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12502] pipe_read oops on sh Rafael J. Wysocki
2009-02-15 0:23 ` Adrian McMenamin
2009-02-15 14:27 ` Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12510] 2.6.29-rc2 dies on startup Rafael J. Wysocki
2009-02-16 21:02 ` Ferenc Wagner
2009-02-16 21:12 ` Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12551] end_request: I/O error, dev cciss/c0d0, sector 87435720 Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12610] sync-Regression in 2.6.28.2? Rafael J. Wysocki
2009-02-21 17:56 ` Theodore Tso
2009-02-22 10:02 ` Rafael J. Wysocki
2009-02-23 4:35 ` Greg KH
2009-02-23 5:37 ` Theodore Tso
2009-02-23 16:54 ` [stable] " Greg KH
2009-02-14 20:38 ` [Bug #12609] v2.6.29-rc2 libata sff 32bit PIO regression Rafael J. Wysocki
2009-02-15 4:20 ` Larry Finger
2009-02-15 8:10 ` Jeff Garzik
2009-02-15 12:05 ` Sergei Shtylyov
2009-02-15 16:48 ` Hugh Dickins
2009-02-14 20:38 ` [Bug #12574] possible circular locking dependency detected Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12571] Suspend-resume on Dell Latitude D410 newly broken in 2.6.29-rc* Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12615] boot hangs while bringing up gianfar ethernet Rafael J. Wysocki
2009-02-15 14:42 ` Peter Korsgaard
2009-02-15 21:08 ` Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12613] [Suspend regression][DRM, RADEON] Rafael J. Wysocki
[not found] ` <4997E7D7.60205@numericable.fr>
2009-02-15 10:20 ` etienne
2009-02-14 20:38 ` [Bug #12659] Failure to resume two Sandisk USB flash drives attached to a Belkin USB Busport Mobile (F5U022) Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12617] unable to compile e100 firmware into kernel Rafael J. Wysocki
2009-02-15 17:38 ` David Woodhouse
2009-02-15 19:58 ` Andrey Borzenkov
2009-02-15 21:09 ` Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12618] hackbench [pthread mode] regression with 2.6.29-rc3 Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1 Rafael J. Wysocki
2009-02-15 8:09 ` Damien Wyart
2009-02-15 9:00 ` Ingo Molnar
2009-02-15 9:51 ` Damien Wyart
2009-02-15 10:13 ` Ingo Molnar
2009-02-15 10:34 ` Damien Wyart
2009-02-15 10:41 ` Damien Wyart
2009-02-15 10:42 ` Damien Wyart
2009-02-15 10:43 ` Damien Wyart
2009-02-15 11:01 ` Ingo Molnar [this message]
2009-02-15 14:06 ` Frederic Weisbecker
2009-02-15 18:03 ` Damien Wyart
2009-02-15 19:18 ` Damien Wyart
2009-02-15 19:31 ` Ingo Molnar
2009-02-16 8:42 ` Damien Wyart
2009-02-16 9:21 ` Ingo Molnar
2009-02-16 10:49 ` Damien Wyart
2009-02-16 9:25 ` Ingo Molnar
2009-02-16 9:27 ` Ingo Molnar
2009-02-16 9:32 ` Ingo Molnar
2009-02-16 9:50 ` Ingo Molnar
2009-02-16 11:56 ` Damien Wyart
2009-02-16 12:26 ` Ingo Molnar
2009-02-16 13:02 ` Damien Wyart
2009-02-16 13:21 ` Ingo Molnar
2009-02-16 16:06 ` Paul E. McKenney
2009-02-16 18:56 ` Paul E. McKenney
2009-02-16 19:08 ` Frederic Weisbecker
2009-02-16 20:02 ` Frederic Weisbecker
2009-02-16 21:31 ` Paul E. McKenney
2009-02-16 20:09 ` Ingo Molnar
2009-02-16 22:39 ` Paul E. McKenney
2009-02-16 22:51 ` Paul E. McKenney
2009-02-17 9:46 ` Ingo Molnar
2009-02-17 14:01 ` Paul E. McKenney
2009-02-17 15:39 ` Damien Wyart
2009-02-17 16:05 ` Paul E. McKenney
2009-02-17 21:48 ` Ingo Molnar
2009-02-17 4:34 ` Frederic Weisbecker
2009-02-17 15:10 ` Paul E. McKenney
2009-02-17 16:00 ` Frederic Weisbecker
2009-02-17 22:37 ` Frederic Weisbecker
2009-02-17 22:48 ` Paul E. McKenney
2009-02-18 0:38 ` Ingo Molnar
2009-02-18 1:02 ` Paul E. McKenney
2009-02-17 6:11 ` Damien Wyart
2009-02-17 15:11 ` Paul E. McKenney
2009-02-16 20:44 ` Damien Wyart
2009-02-15 10:12 ` Christian Kujau
2009-02-15 10:54 ` Ingo Molnar
2009-02-14 20:38 ` [Bug #12668] USB flash disk surprise disconnect Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12663] Commit 8c7e58e690ae60ab4215b025f433ed4af261e103 breaks resume Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12660] Linux 2.6.28.3 freezing on a 32-bits x86 Thinkpad T43p Rafael J. Wysocki
2009-02-14 23:29 ` Mathieu Desnoyers
2009-02-14 20:38 ` [Bug #12680] Not having a VIA PadLock hardware incurs a long delay in probing on modules insertion attempt Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12681] s2ram: fails to wake up on Acer Extensa 4220 (SMP disabled) Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12670] BUG: unable to handle kernel paging request at pin_to_kill+0x21 Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12671] uvc_status_cleanup(): undefined reference to `input_unregister_device' Rafael J. Wysocki
2009-02-14 20:38 ` [Bug #12705] X200: Brightness broken since 2.6.29-rc4-58-g4c098bc Rafael J. Wysocki
2009-02-15 13:43 ` Matthew Garrett
2009-02-15 14:37 ` Rafael J. Wysocki
2009-02-17 23:05 ` Eric Anholt
2009-02-17 23:13 ` Matthew Garrett
2009-02-17 23:23 ` Jesse Barnes
2009-02-18 9:36 ` Nico Schottelius
2009-02-13 9:33 ` Nico Schottelius
2009-02-13 9:40 ` Nico Schottelius
2009-02-13 13:43 ` Matthew Garrett
2009-03-10 2:28 ` Eric Anholt
2009-03-10 5:38 ` Nico Schottelius
2009-02-13 9:42 ` Ingo Molnar
2009-02-13 18:05 ` Len Brown
2009-02-16 9:06 ` ZhangRui
2009-02-16 10:58 ` Nico Schottelius
2009-02-16 13:13 ` Nico Schottelius
2009-02-16 21:40 ` Norbert Preining
2009-02-16 15:54 ` Nico Schottelius
2009-02-19 9:01 ` Nico Schottelius
2009-02-14 20:38 ` [Bug #12706] Oopses and ACPI problems (Linus 2.6.29-rc4) Rafael J. Wysocki
2009-02-16 7:29 ` 2.6.29-rc5: Reported regressions from 2.6.28 Jarek Poplawski
2009-02-16 21:11 ` Rafael J. Wysocki
-- strict thread matches above, loose matches on Subject: below --
2009-02-08 19:05 2.6.29-rc4: " Rafael J. Wysocki
2009-02-08 19:21 ` [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1 Rafael J. Wysocki
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