Re: [proaudio] rt-sources-2.6.23 - problem or not?

[Dominique Michel <dominique.michel@xxxxxxxxxxxx>]

Le Mon, 15 Oct 2007 11:54:17 -0700,
"Mark Knecht" <markknecht@xxxxxxxxx> a écrit :

> On 10/15/07, Dominique Michel <dominique.michel@xxxxxxxxxxxx> wrote:
> 
> >
> > I use udev from more as one year without problem. I also use ivman for
> > automounting of the removable medias. One thing you must pay attention are
> > external drives like usb drive. Ivman doesn't need fstab entries, but in
> > that case, hard disks will not be checked when booting. They also will not
> > be correctly unmounted at shutdown. A regular fstab entry correct this.
> >
> > I could not wait for the ebuild because it have been a lot of work done on
> > the ACPI system. It is 3 days ago that I am running 2.6.23-rt1 without
> > problem. It is the first time that I am able to run a rt kernel with my
> > asus motherboard with APIC and ACPI enabled and that it doesn't crash
> > randomly. I am crossing the fingers.
> >
> > I will try the ebuild in a few days if all goes well.
> >
> > Thanks,
> > Dominique
> 
> I'm up and running 2.6.23-rt1 fine from the ebuild. Rather than using
> make oldconfig I configured the kernel from scratch following the
> HOWTO on the proaudio site. I have been using the realtime-lsm module
> and wanted to see if I could switch over to using PAM.

It is not a problem. You must emerge PAM from the overlay and configure it as
explained by the comment at the end of the merge. You must also disable the
realtime-lsm. This step is not a necessity because PAM will take the control
over the realtime-lsm. But it is no need to run a module that will have no use.

For switching back to the realtime-lsm, it is enough to disable the config of
PAM-rlimits and re-enable the realtime-lsm.

I done some test it was one year ago or so. The difference in performance
between PAM and the realtime-lsm was very little. It was only with a huge load
of the audio system and processor that it was a very little advantage for the
realtime-lsm.
According to a discussion on Agnula email list, it must be possible to get
exactly the same result by playing with PAM parameters.

Dominique

> No probably as
> far as I can tell so far. At least qjackctl starts and aqualung runs
> without xruns so I think things are OK. Needs more testing but no
> complaints.
> 
> I haven't compiled the 1394 stuff yet as they have made major changes
> to the stack and I want to be careful about using that.
> 
> Anyone listening to the new Radiohead album. Available for any price
> you decide to pay, including $0.00. It's my test audio source this
> morning. Go get a copy if you like this sort of stuff.
> 
> lightning ~ # uname -a
> Linux lightning 2.6.23-rt1 #2 PREEMPT RT Mon Oct 15 09:30:59 PDT 2007
> x86_64 AMD Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
> lightning ~ # lsmod
> Module                  Size  Used by
> snd_seq_midi            7232  0
> snd_hdsp               48196  0
> snd_rawmidi            21024  2 snd_seq_midi,snd_hdsp
> snd_hwdep               8328  1 snd_hdsp
> snd_intel8x0           32168  1
> snd_ac97_codec        107992  1 snd_intel8x0
> ac97_bus                3456  1 snd_ac97_codec
> lightning ~ #
> 
> 11:51:02.381 Patchbay deactivated.
> 11:51:02.462 Statistics reset.
> 11:51:02.495 ALSA connection graph change.
> 11:51:02.676 ALSA connection change.
> 11:51:03.508 JACK is starting...
> 11:51:03.508 jackd -R -P80 -p512 -dalsa -dhw:1 -r44100 -p64 -n2
> 11:51:03.511 JACK was started with PID=6446 (0x192e).
> jackd 0.107.4
> Copyright 2001-2005 Paul Davis and others.
> jackd comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> JACK compiled with System V SHM support.
> loading driver ..
> apparent rate = 44100
> creating alsa driver ... hw:1|hw:1|64|2|44100|0|0|nomon|swmeter|-|32bit
> control device hw:1
> configuring for 44100Hz, period = 64 frames, buffer = 2 periods
> ALSA: final selected sample format for capture: 32bit little-endian
> ALSA: use 2 periods for capture
> ALSA: final selected sample format for playback: 32bit little-endian
> ALSA: use 2 periods for playback
> 11:51:05.695 Server configuration saved to "/home/mark/.jackdrc".
> 11:51:05.696 Statistics reset.
> 11:51:05.701 Client activated.
> 11:51:05.703 JACK connection change.
> 11:51:05.707 JACK connection graph change.
> 11:51:07.190 JACK connection graph change.
> 11:51:07.313 JACK connection change.
> 11:51:10.398 JACK connection graph change.
> 
> Anyway, so far so good.
> 
> Cheers,
> Mark
> 
> 


-- 
Dominique Michel

--
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