[linux-audio-dev] some interesting docs for 2.6 testers...

[Michael Ost]

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)
> >
> >
> >
> >
> >