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 <a href="http://www.bartart3d.be/">http://www.bartart3d.be/</a>