[PlanetCCRMA] Jack Realtime Problem, xruns

[Nils Winkler]

Hi,

I'm having problems running Jack, I'm getting lots of xruns. Hardware
should be sufficient, it's a LG W1 notebook with 2 GB RAM and a Core 2
Duo with 2 GHz. Fedora Core 6 with the Planet CCRMA repos enabled. The
versions of Jack installed are: qjackctl-0.2.20-7.fc6 and
jack-audio-connection-kit-0.102.20-3.fc6, both probably from the Extras
repo.

The xruns start showing up before I even attach an application to Jack,
something feels very wrong here.

When I start qjackctl and go to setup, the Realtime checkbox is checked,
but greyed out, so I can't change it. When starting Jack, the "-R"
switch is passed to jackd, but the "RT" LED in the qjackctl display is
dimmed, looks like Realtime is not really working. I did the recommended
changes in /etc/security/limits.conf:

*               -       rtprio          99
*               -       nice            -10
*               -       memlock         4000000

and rebooted, but the problem is still there - before the changes, it
didn't even allow me to start jackd due to missing permissions. Is there
something I'm missing? Any feedback is appreciated.

Thanks,

Nils


Here's the log output from Jack:

20:04:33.856 Patchbay deactivated.
20:04:33.876 Statistics reset.
20:04:33.912 MIDI connection graph change.
20:04:34.081 MIDI connection change.
20:04:46.148 Startup script...
20:04:46.148 artsshell -q terminate
20:04:46.464 Startup script terminated with exit status=256.
20:04:46.464 JACK is starting...
20:04:46.464 jackd -R -dalsa -r48000 -p4096 -n2 -D -Chw:0 -Phw:0
20:04:46.483 JACK was started with PID=14619 (0x391b).
jackd 0.102.20
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 = 48000
creating alsa driver ...
hw:0|hw:0|4096|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0
configuring for 48000Hz, period = 4096 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
**** alsa_pcm: xrun of at least 0.031 msecs
**** alsa_pcm: xrun of at least 0.060 msecs
**** alsa_pcm: xrun of at least 0.031 msecs
**** alsa_pcm: xrun of at least 0.035 msecs
**** alsa_pcm: xrun of at least 0.026 msecs
**** alsa_pcm: xrun of at least 0.032 msecs
**** alsa_pcm: xrun of at least 0.032 msecs
20:04:48.497 Server configuration saved to "/home/nils/.jackdrc".
20:04:48.501 Statistics reset.
20:04:48.823 Client activated.
20:04:48.826 Audio connection change.
20:04:48.835 Audio connection graph change.
**** alsa_pcm: xrun of at least 0.074 msecs
20:04:48.939 XRUN callback (1).
**** alsa_pcm: xrun of at least 0.033 msecs
**** alsa_pcm: xrun of at least 0.040 msecs
**** alsa_pcm: xrun of at least 0.041 msecs
**** alsa_pcm: xrun of at least 0.032 msecs
**** alsa_pcm: xrun of at least 0.039 msecs
**** alsa_pcm: xrun of at least 0.032 msecs
20:04:50.841 XRUN callback (6 skipped).
**** alsa_pcm: xrun of at least 0.027 msecs
**** alsa_pcm: xrun of at least 0.043 msecs
**** alsa_pcm: xrun of at least 0.033 msecs
20:04:52.280 Client deactivated.
20:04:52.283 JACK is stopping...
jack main caught signal 15
no message buffer overruns
20:04:52.502 JACK was stopped successfully.
--
==================================
nils@nilswinkler.com