diagnostic tools to trace the reason xruns are happening?

bart deruyter bart.deruyter at gmail.com
Sun Jun 5 08:24:16 UTC 2011

Hi all,

since recently I'm experiencing more xruns in ubuntustudio 11.04, more
specifically using the lowlatency kernel. My audiocard is an external one,
firewire, and I use the firewire driver. They just started happening out of
the blue, without changing anything significantly. These xruns happen
randomly, not caused by anything I do on the desktop. When I keep qjackctl
running without any audio apps open, now and then, about each half hour, or
20 minutes, there is an xrun.

My limits.conf file seems to be as described on the wiki's over the web, I
have 4 GB or ram, a duocore processor.. I see no reason for problems.
I've got a latency of 17.4 msec, with a setting of 256 Frames/Perios, Sample
Rate of 44100, and 3 Periods/Buffer. So far this was the most stable setup,
though I'm sure I should be able to go to 128 Frames/Period with my
AudioFire12. But I can't, more xruns happen when using this setting. Setting
the samplerate higher I get more xruns too. I'd love to record on 96000, or
even 192000, which is possible with the audiocard, but the computer system
prevents this because of these xruns.

This does make it unreliable for recording, which I want to do more
regularly and it makes me impossible to do recordings for others. I do not
want a system where I have to ask people to start playing again for the
recording because xruns.

So, I was wondering, are there diagnostic tools, test scrips, tracing tools
to get me to the bottom of this?


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