Redhat9/NTPL/SCHED_FIFO (Re: [linux-audio-dev] some interesting docs for 2.6 testers...

[Kjetil S. Matheussen]

This is something I'm wondering about as well. I'm a system administrator
for 8 linux audio workstations, and the university wants us to switch
to redhat 9 (which use ntpl) before the end of the year. If redhat9 doesnt
support SCHED_FIFO, I won't do that, and should tell the university as
soon as possible.


On 23 Jul 2003, Michael Ost wrote:

> Is anyone seeing problems with SCHED_FIFO thread priority and the new
> threading model in the 2.5/2.6 kernel? I read that the mode isn't
> supported. But it (or something that works like it) is fundamentally
> important to my Linux audio application. My audio thread has gotta have
> uninterrupted, top priority scheduling.
>
> There was the start of a thread on this on this mailing list about a
> month ago, but I didn't see many follow up messages. Perhaps some of you
> who are trying to use the new kernel have some information to share.
>
> Thanks... mo
>
> ===================================
> Michael Ost, Software Architect
> Muse Research, Inc.
> most at museresearch.com
>
> On Wed, 2003-07-23 at 09:54, Werner Johansson wrote:
> > I'll give it another shot then, disabling the kudzu-probing (using an Emagic
> > 2|6 USB audio interface on the audio box, so no fancy probing necessary)...
> >
> > Has anyone successfully compiled a recent 2.5 kernel using gcc 3.2-7 (Redhat
> > 8)? I  read some warnings about broken kernel optimizations with gcc 3.x -
> > but that might have been resolved long time ago? I will start digging into
> > this and see what works, audiowise.
> >
> > /Werner
> >
> > ----- Original Message -----
> > From: "Joern Nettingsmeier" <nettings at folkwang-hochschule.de>
> > To: <linux-audio-dev at music.columbia.edu>
> > Sent: Wednesday, July 23, 2003 9:48 AM
> > Subject: Re: [linux-audio-dev] some interesting docs for 2.6 testers...
> >
> >
> > > Werner Johansson wrote:
> > > > Hi!
> > > >
> > > > I've been doing some early 2.5 tests, but as I'm running RH8 with the
> > Planet
> > > > on top of it there seem to be some problems actually building a 2.5
> > kernel
> > > > (the linked texts here mention optimization problems with the default
> > > > RH-shipped gcc as one). So far I haven't been able to boot the 2.5
> > kernels
> > > > properly (yes I have the console working, and the new modutils). Is
> > there
> > > > anything like a FAQ somewhere as how to actually build a kernel that
> > would
> > > > play nicely with a stock RH8 system including Planet CCRMA on top, or do
> > I
> > > > have to redo everything from scratch?
> > >
> > > first of all, you should refer to Documentation/Changes in the kernel
> > > source tree and make sure all your userspace tools are up to date (the
> > > most critical being the modutils).
> > > then you could look at the .config file for the redhat kernel and mimick
> > > the configuration for 2.5 (where applicable). expect some things to
> > > break, though. i usually only do it to the point where the system works
> > > for me and ignore any further boot-time error messages from init scripts
> > > that miss some modules etc.
> > >
> > > disabling hardware scanning seems to help a lot - when i tried the new
> > > kernel on my powerbook running yellowdog, i had to disable kudzu (the
> > > hardware scanning tool).
> > >
> > >
> > > > /Werner
> > > >
> > > > ----- Original Message -----
> > > > From: "Joern Nettingsmeier" <nettings at folkwang-hochschule.de>
> > > > To: <linux-audio-dev at music.columbia.edu>; "ALSA development"
> > > > <alsa-devel at alsa-project.org>
> > > > Sent: Monday, July 21, 2003 8:36 PM
> > > > Subject: [linux-audio-dev] some interesting docs for 2.6 testers...
> > > >
> > > >
> > > >
> > > >>hello everyone!
> > > >>
> > > >>if you are thinking about testing the new 2.6-pre kernels (which would
> > > >>be helpful to shake out problems with typical audio-workloads that might
> > > >>not get tested by others), here are two links worth a read (found on
> > > >>lwn.net):
> > > >>
> > > >>* the 2.5 "what to expect" document by dave jones:
> > > >>   http://lwn.net/Articles/39901/
> > > >>
> > > >>* the wonderful world of linux 2.6 by joe pranevich
> > > >>   http://www.kniggit.net/wwol26.html
> > > >>
> > > >>best,
> > > >>
> > > >>jörn
> > > >>
> > > >>
> > > >>--
> > > >>All Members shall refrain in their international relations from
> > > >>the threat or use of force against the territorial integrity or
> > > >>political independence of any state, or in any other manner
> > > >>inconsistent with the Purposes of the United Nations.
> > > >>-- Charter of the United Nations, Article 2.4
> > > >>
> > > >>
> > > >>Jörn Nettingsmeier
> > > >>Kurfürstenstr 49, 45138 Essen, Germany
> > > >>http://spunk.dnsalias.org (my server)
> > > >>http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > >
> > >
> > > --
> > > All Members shall refrain in their international relations from
> > > the threat or use of force against the territorial integrity or
> > > political independence of any state, or in any other manner
> > > inconsistent with the Purposes of the United Nations.
> > > -- Charter of the United Nations, Article 2.4
> > >
> > >
> > > Jörn Nettingsmeier
> > > Kurfürstenstr 49, 45138 Essen, Germany
> > > http://spunk.dnsalias.org (my server)
> > > http://www.linuxdj.com/audio/lad/ (Linux Audio Developers)
> > >
> > >
> > >
> > >
> > >
>
>
>