From: "Dieter Nützel" <Dieter.Nuetzel@hamburg.de>
To: Robert Love <rml@ufl.edu>, Roger Larsson <roger.larsson@norran.net>
Cc: Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re: Feedback on preemptible kernel patch
Date: Thu, 20 Sep 2001 08:40:56 +0200 [thread overview]
Message-ID: <20010920064042Z274341-760+14433@vger.kernel.org> (raw)
In-Reply-To: <200109140302.f8E32LG13400@zero.tech9.net> <200109181822.f8IIMv618968@mailg.telia.com> <1000855890.19833.51.camel@phantasy>
In-Reply-To: <1000855890.19833.51.camel@phantasy>
Am Mittwoch, 19. September 2001 01:31 schrieb Robert Love:
> On Tue, 2001-09-18 at 14:18, Roger Larsson wrote:
> > Do you run with the playback process reniced -N?
> > It should really run with a low SCHED_FIFO or SCHED_RT policy.
> > But renicing it with a negative value gives some of the benefits...
> > (but you need to run as root)
> > In addition to this the program might need to lock its pages down - the
> > only thing I can think of that could cause several seconds delay would
> > be if it has been swapped out...
>
> Certainly giving it a higher priority should improve results (especially
> with preemption), but the application should receive a fair amount of
> process attention as it is, as it is TASK_RUNNABLE at all times and the
> disk I/O should be routinely preempted. I am interested how much
> renicing it helps, though.
Nearly zero :-)
> Now, if it has to swap pages, that is a very good point. I tend to
> blame this, or perhaps something with a long held lock (the audio
> driver?) for the blips.
System didn't go into swap during whole test, sorry.
> Its so hard to tell swap/VM issues now with all the VM work, sadly...:)
I point to the second;-)
-Dieter
next prev parent reply other threads:[~2001-09-20 6:40 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200109150444.f8F4iEG19063@zero.tech9.net>
[not found] ` <200109140302.f8E32LG13400@zero.tech9.net>
2001-09-14 4:35 ` Feedback on preemptible kernel patch Robert Love
2001-09-15 4:25 ` Dieter Nützel
2001-09-15 5:14 ` Robert Love
2001-09-18 4:06 ` Dieter Nützel
2001-09-18 8:35 ` Daniel Phillips
2001-09-18 18:18 ` Roger Larsson
2001-09-18 23:31 ` Robert Love
2001-09-20 6:40 ` Dieter Nützel [this message]
2001-09-18 23:31 ` Robert Love
2001-09-15 19:18 Robert Love
2001-09-16 1:28 ` Daniel Phillips
2001-09-16 1:54 ` Daniel Phillips
[not found] <Pine.LNX.4.33.0109140838040.21992-100000@sjoerd.sjoerdnet>
2001-09-14 15:04 ` Robert Love
2001-09-15 9:44 ` Arjan Filius
2001-09-15 10:38 ` Erik Mouw
2001-09-15 17:57 ` Robert Love
-- strict thread matches above, loose matches on Subject: below --
2001-09-14 2:47 Dieter Nützel
2001-09-11 22:53 Robert Love
2001-09-08 5:22 grue
2001-09-08 5:47 ` Robert Love
2001-09-08 17:33 ` Arjan Filius
2001-09-08 18:22 ` safemode
2001-09-09 4:40 ` Robert Love
2001-09-09 17:09 ` Robert Love
2001-09-09 21:07 ` Arjan Filius
2001-09-09 21:26 ` Robert Love
2001-09-09 21:23 ` Arjan Filius
2001-09-09 21:37 ` Robert Love
2001-09-10 3:24 ` Daniel Phillips
2001-09-10 3:37 ` Jeremy Zawodny
2001-09-10 5:09 ` Robert Love
2001-09-10 18:25 ` Daniel Phillips
2001-09-10 21:29 ` Arjan Filius
2001-09-13 17:27 ` Robert Love
2001-09-14 7:30 ` george anzinger
2001-09-14 15:01 ` Robert Love
2001-09-11 19:47 ` Arjan Filius
2001-09-09 18:57 ` grue
2001-09-09 21:44 ` Robert Love
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