From: Robert Love <rml@tech9.net>
To: Andrea Arcangeli <andrea@suse.de>
Cc: "Dieter Nützel" <Dieter.Nuetzel@hamburg.de>,
"Roger Larsson" <roger.larsson@norran.net>,
linux-kernel@vger.kernel.org,
"ReiserFS List" <reiserfs-list@namesys.com>
Subject: Re: [PATCH] Preemption Latency Measurement Tool
Date: 20 Sep 2001 17:10:48 -0400 [thread overview]
Message-ID: <1001020249.6048.152.camel@phantasy> (raw)
In-Reply-To: <20010920102139.G729@athlon.random>
In-Reply-To: <1000939458.3853.17.camel@phantasy> <20010920063143.424BD1E41A@Cantor.suse.de> <20010920084131.C1629@athlon.random> <20010920075751.6CA791E6B2@Cantor.suse.de> <20010920102139.G729@athlon.random>
On Thu, 2001-09-20 at 04:21, Andrea Arcangeli wrote:
> > You've forgotten a one liner.
> >
> > #include <linux/locks.h>
> > +#include <linux/compiler.h>
>
> woops, didn't trapped it because of gcc 3.0.2. thanks.
>
> > But this is not enough. Even with reniced artsd (-20).
> > Some shorter hiccups (0.5~1 sec).
>
> I'm not familiar with the output of the latency bench, but I actually
> read "4617" usec as the worst latency, that means 4msec, not 500/1000
> msec.
Right, the patch is returning the length preemption was unavailable
(which is when a lock is held) in us. So it is indded 4ms.
But, I think Dieter is saying he _sees_ 0.5~1s latencies (in the form of
audio skips). This is despite the 4ms locks being held.
--
Robert M. Love
rml at ufl.edu
rml at tech9.net
next prev parent reply other threads:[~2001-09-20 21:11 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-19 22:44 [PATCH] Preemption Latency Measurement Tool Robert Love
2001-09-20 1:40 ` Ignacio Vazquez-Abrams
2001-09-20 2:23 ` safemode
2001-09-20 1:13 ` David Lang
2001-09-20 2:57 ` Robert Love
2001-09-20 2:38 ` Robert Love
2001-09-20 6:31 ` Dieter Nützel
2001-09-20 6:31 ` Dieter Nützel
2001-09-20 20:27 ` Robert Love
[not found] ` <200109202111.f8KLBgG16833@zero.tech9.net>
2001-09-20 22:09 ` [PATCH] Preemption patch 2.4.9-ac12 Robert Love
[not found] ` <20010920063143.424BD1E41A@Cantor.suse.de>
2001-09-20 6:41 ` [PATCH] Preemption Latency Measurement Tool Andrea Arcangeli
2001-09-20 7:57 ` Dieter Nützel
[not found] ` <20010920075751.6CA791E6B2@Cantor.suse.de>
2001-09-20 8:21 ` Andrea Arcangeli
2001-09-20 20:13 ` george anzinger
2001-09-20 20:38 ` Randy.Dunlap
2001-09-20 21:10 ` Robert Love [this message]
2001-09-20 21:35 ` Dieter Nützel
2001-09-20 22:03 ` Oliver Xymoron
2001-09-20 22:51 ` Dieter Nützel
[not found] ` <200109202252.f8KMqLG17327@zero.tech9.net>
2001-09-21 3:17 ` Robert Love
2001-09-21 15:48 ` george anzinger
2001-09-22 21:09 ` Dieter Nützel
2001-09-22 23:40 ` safemode
2001-09-22 23:46 ` Dieter Nützel
2001-09-23 0:15 ` safemode
[not found] ` <200109222340.BAA37547@blipp.internet5.net>
2001-09-23 0:38 ` Roger Larsson
2001-09-23 1:42 ` safemode
2001-09-23 3:02 ` Robert Love
2001-09-23 16:43 ` Roger Larsson
2001-09-23 0:42 ` Dieter Nützel
[not found] ` <200109222341.f8MNfnG25152@zero.tech9.net>
2001-09-23 2:50 ` Robert Love
2001-09-23 3:14 ` george anzinger
2001-09-23 4:06 ` Dieter Nützel
[not found] ` <200109222347.f8MNlMG25157@zero.tech9.net>
2001-09-23 2:54 ` Robert Love
2001-09-27 0:02 ` [reiserfs-list] " Dieter Nützel
[not found] ` <200109230016.f8N0G6G25222@zero.tech9.net>
2001-09-23 2:58 ` Robert Love
[not found] ` <200109222120.f8MLKYG24859@zero.tech9.net>
2001-09-23 2:44 ` Robert Love
[not found] ` <200109200757.JAA60995@blipp.internet5.net>
2001-09-20 17:37 ` Roger Larsson
2001-09-20 21:29 ` Robert Love
2001-09-20 21:53 ` Dieter Nützel
[not found] ` <200109200758.f8K7wEG13675@zero.tech9.net>
2001-09-20 21:09 ` Robert Love
2001-09-20 20:01 ` Tobias Diedrich
2001-09-20 22:01 ` Robert Love
2001-09-22 3:57 ` Andre Pang
2001-09-22 6:10 ` Robert Love
2001-09-22 7:22 ` Andre Pang
2001-09-23 3:18 ` george anzinger
2001-09-23 3:21 ` Robert Love
2001-09-23 7:05 ` Robert Love
2001-09-23 12:03 ` Andre Pang
2001-09-23 18:31 ` Robert Love
2001-09-22 12:56 ` ksoftirqd? (Was: Re: [PATCH] Preemption Latency Measurement Tool) Roger Larsson
2001-09-22 13:14 ` Andrea Arcangeli
2001-09-22 20:51 ` Roger Larsson
2001-09-22 21:33 ` Andrea Arcangeli
[not found] <200109202253.RAA21082@waste.org>
2001-09-20 23:15 ` [PATCH] Preemption Latency Measurement Tool Oliver Xymoron
2001-09-21 0:42 ` Roger Larsson
2001-09-21 1:03 ` Alan Cox
2001-09-21 1:22 ` Andrea Arcangeli
2001-09-21 1:51 ` Rik van Riel
2001-09-21 1:38 ` Roger Larsson
2001-09-21 1:53 ` Roger Larsson
2001-09-21 2:08 ` Roger Larsson
2001-09-21 2:29 ` Rik van Riel
2001-09-21 16:24 ` Jussi Laako
2001-09-21 16:36 ` Alan Cox
2001-09-21 18:46 ` Thomas Sailer
2001-09-22 10:30 ` Jussi Laako
2001-09-21 16:18 ` Stefan Westerfeld
2001-09-21 20:18 ` Dieter Nützel
[not found] ` <200109212018.f8LKImG21229@zero.tech9.net>
2001-09-21 21:47 ` Robert Love
-- strict thread matches above, loose matches on Subject: below --
2002-04-09 5:23 [PATCH] preemption latency measurement tool Robert Love
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