Ralf, thanks for the explanation. It does work better with the performance setting. I do still get xruns when using midi though. Using sooperlooper, I trigger recording with the pedal of my keyboard, through an usb2midi misport2x2. I guess the search for the PREEMPT_RT kernel is in place.. is there a PPA I could use, or do I have to build it myself? Or is it the linux-headers-2.6.31-12-realtime? I have it listed in the falk-tx ppa. grtz, Bart <a href="http://www.bartart3d.be/">http://www.bartart3d.be/</a> <div class="gmail_quote">2011/6/5 Ralf Mardorf <<a href="mailto:ralf.mardorf@alice-dsl.net">ralf.mardorf@alice-dsl.net</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> <div class="im">On Sun, 2011-06-05 at 11:44 +0200, bart deruyter wrote: > Ok, I did some tests, xruns keep happening on 512 Frames/Period and > 1024 Frames/Period at 48000, setting Periods/Buffer at 2. At 3 > Periods/Buffer there is too much latency in my opinion. > > Next step, how do I change the governer from 'ondemand' to > 'performance'? I've never done that before, didn't even need to do > that in the previous ubuntustudio versions. </div>You can run sudo -i cpufreq-selector -g performance The better choice is to right click to the GNOME panel > Add to panel... > CPU frequency scaling monitor Once it is in the panel, left click to the scaling monitor icon and chose 'performance'. <div class="im"> > > About the kernel : > Weird, I keep reading from ubuntustudio that the generic kernel in > Ubuntustuido 11.04 should be good enough, on the wiki with the > comparing table I read better results from the lowlatency kernel.. and > now there is the need for the preempt rt.... It is getting very, very, > very confusing for me. > > but thanks for the help of course.. step by step, we'll get there.. we > just have to. </div>For kernels before version 2.6.39 and this version isn't supported by any repository jet, real-time optimisation only is done with kernel-rt. A kernel without RT can work too, but when you get issues, then use a kernel-rt. Hth, Ralf -- <div><div></div><div class="h5">Ubuntu-Studio-users mailing list <a href="mailto:Ubuntu-Studio-users@lists.ubuntu.com">Ubuntu-Studio-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users</a> </div></div></blockquote></div>