From: Kevin Shanahan <kmshanah@ucwb.org.au>
To: Avi Kivity <avi@redhat.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
"Ingo Molnar" <mingo@elte.hu>, "Rafael J. Wysocki" <rjw@sisk.pl>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Kernel Testers List" <kernel-testers@vger.kernel.org>,
"Mike Galbraith" <efault@gmx.de>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
bugme-daemon@bugzilla.kernel.org
Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected)
Date: Thu, 22 Jan 2009 01:21:42 +1030 [thread overview]
Message-ID: <1232549502.4895.124.camel@kulgan.wumi.org.au> (raw)
In-Reply-To: <49773275.3020203@redhat.com>
On Wed, 2009-01-21 at 16:34 +0200, Avi Kivity wrote:
> Kevin Shanahan wrote:
> > On Tue, 2009-01-20 at 19:47 +0200, Avi Kivity wrote:
> >> Kevin, can you retest with kvm at realtime priority?
...
> > --- hermes-old.wumi.org.au ping statistics ---
> > 900 packets transmitted, 900 received, 0% packet loss, time 899326ms
> > rtt min/avg/max/mdev = 0.093/0.157/3.611/0.117 ms
> >
> > So, a _huge_ difference. But what does it mean?
>
> It means, a scheduling problem. Can you run the latency tracer (which
> only works with realtime priority), so we can tell if it is (a) kvm
> failing to wake up the vcpu properly or (b) the scheduler delaying the
> vcpu from running.
Sorry, but are you sure that's going to be useful?
If it only works on realtime threads and I'm not seeing the problem when
running kvm with realtime priority, is this going to tell you what you
want to know?
Not trying to be difficult, but that just didn't make sense to me.
Regards,
Kevin.
next prev parent reply other threads:[~2009-01-21 14:52 UTC|newest]
Thread overview: 133+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-19 21:41 2.6.29-rc2-git1: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-01-19 21:41 ` [Bug #11849] default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems) Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12061] snd_hda_intel: power_save: sound cracks on powerdown Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12208] uml is very slow on 2.6.28 host Rafael J. Wysocki
2009-01-26 11:35 ` Miklos Szeredi
2009-01-19 21:45 ` [Bug #12160] networking oops after resume from s2ram (2.6.28-rc6) Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12159] 2.6.28-rc6-git1 -- No sound produced from Intel HDA ALSA driver Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12263] Sata soft reset filling log Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12260] Regression due to commit 2b80848e3818fb1c (p54usb: support LM87 firmwares) Rafael J. Wysocki
2009-01-20 22:11 ` [PATCH -stable] p54usb: fix traffic stalls / packet drop Christian Lamparter
2009-01-20 22:36 ` Rafael J. Wysocki
2009-01-20 22:39 ` Greg KH
2009-01-20 23:56 ` John W. Linville
2009-01-21 14:03 ` Christian Lamparter
2009-01-19 21:45 ` [Bug #12224] journal activity on inactive partition causes inactive harddrive spinup Rafael J. Wysocki
2009-01-20 13:03 ` Theodore Tso
2009-01-19 21:45 ` [Bug #12209] oldish top core dumps (in its meminfo() function) Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12265] FPU emulation broken in 2.6.28-rc8 ? Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12264] i915: switching from kwin in opengl mode to a VT then back to x11, x11 freezes Rafael J. Wysocki
2009-01-20 18:13 ` Caleb Cushing
2009-01-19 21:45 ` [Bug #12337] ~100 extra wakeups reported by powertop Rafael J. Wysocki
2009-01-20 9:38 ` Alberto Gonzalez
2009-01-19 21:45 ` [Bug #12391] Processor does not go below C2 state until usb.autosuspend is enabled Rafael J. Wysocki
2009-01-27 10:27 ` Pavel Machek
2009-01-19 21:45 ` [Bug #12395] 2.6.28-rc9: oprofile regression Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12393] debugging in dosemu causes lots of 'scheduling while atomic' Rafael J. Wysocki
2009-01-20 9:58 ` Michal Suchanek
2009-01-19 21:45 ` [Bug #12396] hwinfo problem since 2.6.28 Rafael J. Wysocki
2009-01-26 14:00 ` Beschorner Daniel
2009-01-19 21:45 ` [Bug #12404] Oops in 2.6.28-rc9 and -rc8 -- mtrr issues / e1000e Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12403] TTY problem on linux-2.6.28-rc7 Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s Rafael J. Wysocki
2009-01-20 7:30 ` Tino Keitel
2009-01-19 21:45 ` [Bug #12406] 2.6.28 thinks that my PS/2 mouse is a touchpad Rafael J. Wysocki
2009-01-20 1:45 ` Arjan Opmeer
2009-01-20 9:19 ` Dmitry Torokhov
2009-01-22 6:29 ` Alexander E. Patrakov
2009-01-19 21:45 ` [Bug #12407] Kernel 2.6.28 regression: Hang after hibernate Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12408] Funny problem with 2.6.28: Kernel stalls Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12405] oops in __bounce_end_io_read under kvm Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12409] NULL pointer dereference at get_stats() Rafael J. Wysocki
2009-01-21 16:18 ` Frederik Deweerdt
2009-01-24 0:39 ` Tetsuo Handa
2009-02-07 2:34 ` Tetsuo Handa
2009-02-09 11:19 ` Tetsuo Handa
2009-02-11 22:54 ` Alok Kataria
2009-02-11 23:02 ` Alok Kataria
2009-02-13 11:54 ` Tetsuo Handa
2009-01-19 21:45 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-01-20 0:12 ` Kevin Shanahan
2009-01-20 11:35 ` Ingo Molnar
2009-01-20 12:37 ` Avi Kivity
2009-01-20 12:42 ` Kevin Shanahan
2009-01-20 12:56 ` Ingo Molnar
2009-01-20 13:07 ` Ingo Molnar
2009-01-20 14:59 ` Steven Rostedt
2009-01-20 15:04 ` Ingo Molnar
2009-01-20 17:53 ` Steven Rostedt
2009-01-20 18:39 ` Ingo Molnar
2009-01-20 17:47 ` Avi Kivity
2009-01-21 14:25 ` Kevin Shanahan
2009-01-21 14:34 ` Avi Kivity
2009-01-21 14:51 ` Kevin Shanahan [this message]
2009-01-21 14:59 ` Avi Kivity
2009-01-21 15:13 ` Steven Rostedt
2009-01-22 1:48 ` Steven Rostedt
2009-01-21 15:10 ` Steven Rostedt
2009-01-21 15:18 ` Ingo Molnar
2009-01-22 19:57 ` Kevin Shanahan
2009-01-22 20:31 ` Ingo Molnar
2009-01-26 9:55 ` Kevin Shanahan
2009-01-26 11:35 ` Peter Zijlstra
2009-01-26 14:38 ` [RFC][PATCH] ftrace: function graph trace context switches Peter Zijlstra
2009-01-26 15:39 ` Frédéric Weisbecker
2009-01-26 15:41 ` Steven Rostedt
2009-03-16 17:57 ` Frederic Weisbecker
2009-01-26 15:00 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Ingo Molnar
2009-01-20 14:23 ` Kevin Shanahan
2009-01-20 14:25 ` Ingo Molnar
2009-01-20 15:51 ` Kevin Shanahan
2009-01-20 16:06 ` Ingo Molnar
2009-01-20 16:19 ` Peter Zijlstra
2009-01-20 14:46 ` Frédéric Weisbecker
2009-01-20 13:04 ` Avi Kivity
2009-01-20 17:54 ` Kevin Shanahan
2009-01-20 18:42 ` Ingo Molnar
2009-01-19 21:45 ` [Bug #12411] 2.6.28: BUG in r8169 Rafael J. Wysocki
2009-01-19 21:45 ` [Bug #12426] TMDC Joystick no longer works in kernel 2.6.28 Rafael J. Wysocki
2009-01-21 0:48 ` Andrew S. Johnson
2009-01-22 13:34 ` Jiri Kosina
2009-01-23 2:06 ` Andrew S. Johnson
2009-01-26 11:49 ` Jiri Kosina
2009-01-19 21:45 ` [Bug #12483] Reference to inexistent struct dmi_device_id breaks the build Rafael J. Wysocki
2009-01-20 8:15 ` Jean Delvare
2009-01-19 21:45 ` [Bug #12500] r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out Rafael J. Wysocki
2009-01-22 16:43 ` 2.6.29-rc2-git1: Reported regressions 2.6.27 -> 2.6.28 Jörg-Volker Peetz
2009-01-24 13:25 ` Rolf Eike Beer
2009-02-04 10:55 2.6.29-rc3-git6: " Rafael J. Wysocki
2009-02-04 10:58 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-02-05 19:35 ` Kevin Shanahan
2009-02-05 22:37 ` Rafael J. Wysocki
2009-02-14 20:48 2.6.29-rc5: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-02-14 20:50 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-02-23 22:00 2.6.29-rc6: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-02-23 22:03 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-02-24 0:59 ` Kevin Shanahan
2009-02-24 1:37 ` Rafael J. Wysocki
2009-02-24 12:09 ` Avi Kivity
2009-02-24 22:11 ` Kevin Shanahan
2009-03-03 19:34 2.6.29-rc6-git7: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-03-03 19:41 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-03-04 3:08 ` Kevin Shanahan
2009-03-08 10:04 ` Avi Kivity
2009-03-14 19:11 2.6.29-rc8: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-03-14 19:20 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-03-15 9:03 ` Kevin Shanahan
2009-03-15 9:18 ` Avi Kivity
2009-03-15 9:48 ` Ingo Molnar
2009-03-15 9:56 ` Avi Kivity
2009-03-15 10:03 ` Ingo Molnar
2009-03-15 10:13 ` Avi Kivity
2009-03-16 9:49 ` Avi Kivity
2009-03-16 12:46 ` Kevin Shanahan
2009-03-16 20:07 ` Frederic Weisbecker
2009-03-16 22:55 ` Kevin Shanahan
2009-03-18 0:20 ` Frederic Weisbecker
2009-03-18 1:16 ` Kevin Shanahan
2009-03-18 2:24 ` Frederic Weisbecker
2009-03-18 21:24 ` Kevin Shanahan
2009-03-21 5:00 ` Kevin Shanahan
2009-03-21 14:08 ` Frederic Weisbecker
2009-03-24 11:44 ` Frederic Weisbecker
2009-03-24 11:47 ` Frederic Weisbecker
2009-03-25 23:40 ` Kevin Shanahan
2009-03-25 23:48 ` Frederic Weisbecker
2009-03-26 20:22 ` Kevin Shanahan
2009-03-21 17:01 2.6.29-rc8-git5: Reported regressions 2.6.27 -> 2.6.28 Rafael J. Wysocki
2009-03-21 17:07 ` [Bug #12465] KVM guests stalling on 2.6.28 (bisected) Rafael J. Wysocki
2009-03-21 19:50 ` Ingo Molnar
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