[LAU] Xruns on Ubuntu 8.04, two machines

[Johannes Mario Ringheim]

After upgrading to Ubuntu Hardy (8.04), I'm having (too many) xruns on 
two different machines. Both worked perfectly on 7.04.

On both machines the "RT" indicator on qjackctl keeps blinking. On 7.04 
it was always dimmed, and everything worked fine. Does someone know what 
that "RT" indicator in qjackctl means? When it is dimmed, do you not 
have proper realtime scheduling?

On my laptop, with a Behringer UCA202 USB soundcard, there are xruns on 
some of the "RT" blinks. On my PC, with an M-Audio Delta66, there are 
one xrun on the first blink, and on every subsequent blink a message 
saying "XRUN callback (40 skipped).". Then there's about forty lines 
saying "delay of 36196.000 usecs exceeds estimated spare time of 
11579.000; restart ...". I've included a portion of the jackd output below.

Things I've tried so far are modifying /etc/security/limits.conf, 
installing linux-rt kernel and adding "nohz=off" in /boot/grub/menu.lst. 
I've also tweaked the settings in qjackctl. Higher latency makes less of 
the problems, but there are still xruns while the computer(s) are idle.

Any suggestions would be welcome!

---

19:15:36.392 /usr/bin/jackd -R -P70 -dalsa -dhw:1 -r44100 -p512 -n3
jackd 0.109.2
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.
19:15:36.410 JACK was started with PID=6360.
loading driver ..
apparent rate = 44100
creating alsa driver ... hw:1|hw:1|512|3|44100|0|0|nomon|swmeter|-|32bit
control device hw:1
configuring for 44100Hz, period = 512 frames (11.6 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 32bit little-endian
ALSA: use 3 periods for capture
ALSA: final selected sample format for playback: 32bit little-endian
ALSA: use 3 periods for playback
19:15:38.553 Server configuration saved to "/home/djauto/.jackdrc".
19:15:38.554 Statistics reset.
19:15:38.601 Client activated.
19:15:38.603 JACK connection change.
19:15:38.625 JACK connection graph change.
19:15:42.826 XRUN callback (1).
delay of 36342.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36257.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36270.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36270.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36286.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36279.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36263.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36271.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36279.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36281.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36258.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36265.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36283.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36272.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
19:15:44.609 XRUN callback (37 skipped).
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36271.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36271.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36286.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36261.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36255.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36261.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36272.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36281.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36283.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36281.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36281.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36286.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36282.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36269.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36285.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36284.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36271.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
19:15:46.613 XRUN callback (40 skipped).
delay of 36289.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36262.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36279.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36282.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36255.000 usecs exceeds estimated spare time of 11564.000; 
restart ...
delay of 36271.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36279.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36272.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36272.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36272.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36279.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36280.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36263.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36256.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36263.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36278.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36283.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36272.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36275.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36274.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36277.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36276.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
delay of 36273.000 usecs exceeds estimated spare time of 11579.000; 
restart ...
19:15:48.617 XRUN callback (41 skipped).


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