diagnostic tools to trace the reason xruns are happening?

Robert Klaar nim.batu at gmail.com
Sun Jun 5 09:00:13 UTC 2011

What happens if you set the frames/period settings higher? I have similar
setup and can't get it to run on any lower than 1024 frames(if I want to
avoid xruns), but then I've set the sample rate to 48000. I've never noticed
any problems with the latency, it's at 46 or something now but I can't hear
any difference between this and something lower, can you? .)


On Sun, Jun 5, 2011 at 10:24 AM, bart deruyter <bart.deruyter at gmail.com>wrote:

> 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?
> Grtz,
> Bart
> http://www.bartart3d.be/
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