From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Florian Schmidt <mista.tapas@gmx.net>,
"K.R. Foley" <kr@cybsft.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
felipe_alfaro@linuxmail.org
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk12-R5
Date: Sun, 05 Sep 2004 17:03:12 -0400 [thread overview]
Message-ID: <1094418192.4445.58.camel@krustophenia.net> (raw)
In-Reply-To: <20040905191227.GA29797@elte.hu>
On Sun, 2004-09-05 at 15:12, Ingo Molnar wrote:
> * Lee Revell <rlrevell@joe-job.com> wrote:
>
> > Ok, first new one in a while. This was with -R0, but I haven't seen
> > anyone else report it. Let me know if you need the complete trace.
> >
> > preemption latency trace v1.0.2
> > -------------------------------
> > latency: 511 us, entries: 951 (951)
> > -----------------
> > | task: dbench/4810, uid:1000 nice:0 policy:0 rt_prio:0
> > -----------------
> > => started at: kill_pg_info+0x10/0x50
> > => ended at: kill_pg_info+0x2e/0x50
> > =======>
> > 00000001 0.000ms (+0.000ms): kill_pg_info (sys_kill)
> > 00000001 0.000ms (+0.000ms): __kill_pg_info (kill_pg_info)
> > 00000001 0.000ms (+0.000ms): find_pid (__kill_pg_info)
>
> this is quite hard to fix - lots of processes were SIGKILL-ed (or
> SIGTERM-ed) and the signal semantics require us to deliver signals
> atomically. The only fix would be to turn the signal locks into
> semaphores but that's quite hard. (it's also a bit problematic for
> interrupt-delivered signals.)
>
> Ingo
>
Here is a histogram I generated using realfeel2. This should provide
better data than my jackd histograms because the latter are dependent on
the ALSA driver, jackd's design, etc.
I had to modify the amlat utilities to use usecs instead of msecs, this
is a very good sign. ;-)
http://krustophenia.net/testresults.php?dataset=2.6.9-rc1-R0#/var/www/2.6.9-rc1-R0/foo.hist
I find the two smaller spikes to either side of the central spike really
odd. These showed up in my jackd tests too, I had attributed them to
some measurement artifact, but they seem real. Maybe a rounding bug, or
some kind of weird cache effect?
Lee
next prev parent reply other threads:[~2004-09-05 21:03 UTC|newest]
Thread overview: 223+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20040903120957.00665413@mango.fruits.de>
[not found] ` <20040903100946.GA22819@elte.hu>
[not found] ` <20040903123139.565c806b@mango.fruits.de>
2004-09-03 10:32 ` lockup with voluntary preempt R0 and VP, KP, etc, disabled Ingo Molnar
2004-09-03 11:59 ` Florian Schmidt
2004-09-03 11:55 ` Ingo Molnar
2004-09-03 13:01 ` Florian Schmidt
2004-09-03 12:04 ` Florian Schmidt
2004-09-03 12:08 ` Florian Schmidt
2004-09-03 18:28 ` Lee Revell
2004-09-03 18:54 ` Florian Schmidt
2004-09-03 18:52 ` Lee Revell
2004-09-03 19:06 ` K.R. Foley
2004-09-04 19:51 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R4 Ingo Molnar
2004-09-05 14:02 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R5 Ingo Molnar
2004-09-05 16:07 ` Matt Heler
2004-09-05 18:16 ` Lee Revell
2004-09-05 19:12 ` Ingo Molnar
2004-09-05 21:03 ` Lee Revell [this message]
2004-09-06 6:30 ` Ingo Molnar
2004-09-06 7:44 ` Lee Revell
2004-09-07 3:17 ` K.R. Foley
2004-09-06 11:06 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R6 Ingo Molnar
2004-09-06 11:48 ` Rafael J. Wysocki
2004-09-06 12:25 ` Alexander Nyberg
2004-09-06 12:29 ` Ingo Molnar
2004-09-07 9:26 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R7 Ingo Molnar
2004-09-07 11:57 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R8 Ingo Molnar
2004-09-07 14:50 ` Alexander Nyberg
2004-09-07 15:04 ` Ingo Molnar
2004-09-07 15:29 ` Alexander Nyberg
2004-09-07 19:56 ` Rafael J. Wysocki
2004-09-07 22:59 ` Lee Revell
2004-09-08 8:20 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R9 Ingo Molnar
2004-09-08 9:46 ` Rafael J. Wysocki
2004-09-08 9:56 ` Ingo Molnar
2004-09-08 22:37 ` Lee Revell
2004-09-09 6:17 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-S0 Ingo Molnar
2004-09-09 19:30 ` Lee Revell
2004-09-09 20:23 ` Lee Revell
2004-09-19 12:26 ` [patch] voluntary-preempt-2.6.9-rc2-mm1-S1 Ingo Molnar
2004-09-19 17:05 ` Felipe Alfaro Solana
2004-09-20 17:14 ` K.R. Foley
2004-09-20 19:48 ` Ingo Molnar
2004-09-21 2:25 ` K.R. Foley
2004-09-20 19:47 ` Magnus Määttä
2004-09-21 2:07 ` BKL backtraces - was: " K.R. Foley
2004-09-21 7:18 ` Ingo Molnar
2004-09-21 7:44 ` [patch] voluntary-preempt-2.6.9-rc2-mm1-S2 Ingo Molnar
2004-09-21 18:51 ` K.R. Foley
2004-09-22 10:33 ` [patch] voluntary-preempt-2.6.9-rc2-mm1-S3 Ingo Molnar
2004-09-22 15:07 ` K.R. Foley
2004-09-22 17:16 ` Lee Revell
2004-09-22 17:40 ` K.R. Foley
2004-09-22 19:45 ` Ingo Molnar
2004-09-22 17:09 ` K.R. Foley
2004-09-22 19:08 ` Lee Revell
2004-09-23 1:13 ` Lee Revell
2004-09-23 12:28 ` [patch] voluntary-preempt-2.6.9-rc2-mm1-S4 Ingo Molnar
2004-09-23 12:57 ` Norberto Bensa
2004-09-23 13:01 ` Ingo Molnar
2004-09-23 13:07 ` Ingo Molnar
2004-09-23 13:09 ` Ingo Molnar
2004-09-23 16:46 ` Norberto Bensa
2004-09-23 17:13 ` Norberto Bensa
2004-09-23 18:20 ` Ingo Molnar
2004-09-23 13:35 ` Rui Nuno Capela
2004-09-23 13:40 ` Ingo Molnar
2004-09-23 16:23 ` Rui Nuno Capela
2004-09-23 18:07 ` Rui Nuno Capela
2004-09-24 12:43 ` OHCI_QUIRK_INITRESET (was: 2.6.9-rc2-mm2 ohci_hcd doesn't work) Rui Nuno Capela
2004-09-24 12:55 ` Ingo Molnar
2004-09-24 14:00 ` Rui Nuno Capela
2004-09-24 16:16 ` Bjorn Helgaas
2004-09-25 23:37 ` David Brownell
2004-09-26 13:09 ` Rui Nuno Capela
2004-09-27 15:11 ` Bjorn Helgaas
2004-09-23 21:12 ` [patch] voluntary-preempt-2.6.9-rc2-mm3-S5 Ingo Molnar
2004-09-24 0:32 ` Rui Nuno Capela
2004-09-24 2:22 ` K.R. Foley
2004-09-24 3:30 ` K.R. Foley
2004-09-24 7:40 ` Ingo Molnar
2004-09-24 11:05 ` K.R. Foley
2004-09-24 11:45 ` Ingo Molnar
2004-09-24 7:44 ` [patch] voluntary-preempt-2.6.9-rc2-mm3-S6 Ingo Molnar
2004-09-28 0:05 ` [patch] voluntary-preempt-2.6.9-rc2-mm4-S7 Ingo Molnar
2004-09-28 20:17 ` Rui Nuno Capela
2004-09-28 21:03 ` Rui Nuno Capela
2004-09-28 21:46 ` Rui Nuno Capela
2004-09-28 22:01 ` Matt Heler
2004-09-29 17:43 ` Lee Revell
2004-09-29 18:40 ` Lee Revell
2004-09-29 20:30 ` Ingo Molnar
2004-09-29 20:34 ` Lee Revell
2004-10-02 3:02 ` Lee Revell
2004-10-02 9:50 ` Ingo Molnar
2004-10-03 2:01 ` Lee Revell
2004-10-03 2:14 ` Lee Revell
2004-10-03 2:19 ` Lee Revell
2004-10-03 20:08 ` Ingo Molnar
2004-10-03 6:37 ` Lee Revell
2004-10-03 6:50 ` Lee Revell
2004-10-03 7:06 ` Lee Revell
2004-10-03 19:57 ` Ingo Molnar
2004-10-04 0:53 ` Lee Revell
2004-10-04 10:17 ` Ingo Molnar
2004-10-04 17:20 ` Lee Revell
2004-10-03 20:05 ` Ingo Molnar
2004-10-03 21:09 ` [patch] voluntary-preempt-2.6.9-rc3-mm1-S8 Ingo Molnar
2004-10-04 21:53 ` [patch] voluntary-preempt-2.6.9-rc3-mm1-S9 Ingo Molnar
2004-10-05 0:31 ` Lee Revell
2004-10-05 0:56 ` Florian Schmidt
2004-10-05 0:45 ` Lee Revell
2004-10-05 0:38 ` Andrew Rodland
2004-10-05 1:19 ` Rui Nuno Capela
2004-10-05 5:32 ` Peter Williams
2004-10-05 6:38 ` Ingo Molnar
2004-10-05 1:42 ` Florian Schmidt
2004-10-05 2:05 ` Florian Schmidt
2004-10-05 3:09 ` Andrew Rodland
2004-10-05 10:24 ` Florian Schmidt
2004-10-05 7:02 ` [patch] voluntary-preempt-2.6.9-rc3-mm2-T0 Ingo Molnar
2004-10-05 11:11 ` Rui Nuno Capela
2004-10-05 11:17 ` Ingo Molnar
2004-10-05 12:07 ` Hugh Dickins
2004-10-05 11:12 ` Florian Schmidt
2004-10-05 11:03 ` Ingo Molnar
2004-10-05 11:14 ` Rui Nuno Capela
2004-10-05 11:16 ` Ingo Molnar
2004-10-05 13:47 ` [patch] voluntary-preempt-2.6.9-rc3-mm2-T1 Ingo Molnar
2004-10-05 16:37 ` Rui Nuno Capela
2004-10-05 18:42 ` Ingo Molnar
2004-10-05 19:38 ` Rui Nuno Capela
2004-10-05 19:44 ` Ingo Molnar
2004-10-05 20:01 ` Rui Nuno Capela
2004-10-06 0:12 ` Lee Revell
2004-10-06 7:51 ` Ingo Molnar
2004-10-07 10:52 ` [patch] voluntary-preempt-2.6.9-rc3-mm3-T3 Ingo Molnar
[not found] ` <20041007134116.3e53b239.h.mth@web.de>
2004-10-07 11:44 ` Ingo Molnar
2004-10-07 12:08 ` Hanno Meyer-Thurow
2004-10-07 12:16 ` Rui Nuno Capela
2004-10-07 13:53 ` Rui Nuno Capela
2004-10-07 14:13 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Con Kolivas
2004-10-07 23:26 ` [patch] voluntary-preempt-2.6.9-rc3-mm3-T3 Rui Nuno Capela
2004-10-08 5:36 ` Lee Revell
2004-10-08 6:49 ` Con Kolivas
2004-10-08 18:05 ` Lee Revell
2004-10-08 7:06 ` Ingo Molnar
2004-10-08 7:36 ` Peter Williams
2004-10-08 17:27 ` Lee Revell
2004-10-07 17:55 ` K.R. Foley
2004-10-07 20:29 ` K.R. Foley
2004-10-07 21:55 ` Ingo Molnar
2004-10-08 1:41 ` K.R. Foley
2004-10-08 7:02 ` Ingo Molnar
2004-10-08 14:03 ` K.R. Foley
2004-10-08 14:28 ` Ingo Molnar
2004-10-08 21:14 ` Lee Revell
2004-10-08 23:11 ` Lee Revell
2004-10-09 4:16 ` Lee Revell
2004-10-09 4:57 ` Lee Revell
2004-10-09 5:09 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Con Kolivas
2004-10-09 5:21 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Lee Revell
2004-10-09 5:23 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Con Kolivas
2004-10-09 5:31 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Lee Revell
2004-10-09 5:34 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Con Kolivas
2004-10-09 5:50 ` Preemption model (was Re: voluntary-preempt-2.6.9-rc3-mm3-T3) Lee Revell
2004-10-09 5:53 ` Con Kolivas
2004-10-09 10:46 ` voluntary-preempt-2.6.9-rc3-mm3-T3 Ingo Molnar
2004-10-09 13:21 ` voluntary-preempt-2.6.9-rc3-mm3-T3 K.R. Foley
2004-10-09 18:16 ` [patch] voluntary-preempt-2.6.9-rc3-mm3-T3 Florian Schmidt
2004-10-11 14:29 ` [patch] CONFIG_PREEMPT_REALTIME, 'Fully Preemptible Kernel', VP-2.6.9-rc4-mm1-T4 Ingo Molnar
2004-10-11 17:48 ` Florian Schmidt
2004-10-11 21:22 ` Rui Nuno Capela
2004-10-11 21:37 ` Lee Revell
2004-10-12 4:30 ` [patch] voluntary-preempt-2.6.9-rc3-mm3-T3 Lee Revell
2004-10-12 9:17 ` Ingo Molnar
2004-10-13 16:52 ` Lee Revell
2004-10-13 16:48 ` Lee Revell
2004-10-08 11:16 ` [patch] voluntary-preempt-2.6.9-rc3-mm2-T1 William Lee Irwin III
2004-09-22 17:30 ` Oops in __posix_lock_file was:Re: [patch] voluntary-preempt-2.6.9-rc2-mm1-S2 K.R. Foley
2004-09-22 19:43 ` Ingo Molnar
2004-09-21 18:24 ` [patch] voluntary-preempt-2.6.9-rc2-mm1-S1 K.R. Foley
2004-09-21 19:21 ` Ingo Molnar
2004-09-21 19:37 ` K.R. Foley
2004-09-08 6:56 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R6 Lee Revell
2004-09-09 19:29 ` Ingo Molnar
2004-09-09 19:33 ` Lee Revell
2004-09-09 20:43 ` Lee Revell
2004-09-09 20:51 ` Ingo Molnar
2004-09-09 21:03 ` Scott Wood
2004-09-09 20:05 ` Andrew Morton
2004-09-09 20:09 ` Alan Cox
2004-09-09 21:28 ` Andrew Morton
2004-09-09 22:45 ` William Lee Irwin III
2004-09-09 22:11 ` Alan Cox
2004-09-09 23:20 ` William Lee Irwin III
2004-09-10 13:28 ` Ingo Molnar
2004-09-10 14:28 ` Paolo Ciarrocchi
2004-09-10 16:45 ` Lee Revell
2004-09-10 22:54 ` Lee Revell
2004-09-11 0:21 ` K.R. Foley
2004-09-09 20:13 ` Lee Revell
2004-09-22 0:17 ` William Lee Irwin III
2004-09-07 22:55 ` [patch] voluntary-preempt-2.6.9-rc1-bk12-R5 Lee Revell
2004-09-07 23:13 ` Lee Revell
2004-09-07 23:58 ` Rui Nuno Capela
2004-09-08 8:23 ` Ingo Molnar
2004-09-08 8:31 ` Ingo Molnar
2004-09-09 11:09 ` Rui Nuno Capela
2004-09-15 1:16 ` Lee Revell
2004-09-15 9:29 ` Rui Nuno Capela
2004-09-15 9:38 ` Ingo Molnar
2004-09-15 9:53 ` Rui Nuno Capela
2004-09-15 10:00 ` Ingo Molnar
2004-09-15 10:35 ` Rui Nuno Capela
2004-09-25 19:26 ` Lee Revell
2004-09-25 20:38 ` Ingo Molnar
2004-09-25 20:40 ` Lee Revell
2004-09-25 20:50 ` Duncan Sands
2004-09-25 23:54 ` Lee Revell
2004-09-26 13:42 ` Rui Nuno Capela
2004-09-08 8:46 ` Rui Nuno Capela
2004-09-08 8:52 ` Ingo Molnar
2004-09-05 14:49 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R4 Florian Schmidt
2004-09-05 14:53 ` K.R. Foley
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