high dsp load causing xruns in recent ubuntu distros (studio, kx-studio)
I tried moving from ubuntu studio 10.04 LTS to 12.04 LTS recently because i wanted to take advantage of the device support of the new ffado drivers.
I stumbled upon performance issues with 12.04:
An Ardour session I recently created with 10.04 that uses quite a number of tracks and plugins now causes dozens of xruns because dsp load is constantly over 90% up to 100%. Dsp load is around 1-3% in idle mode.
The same session with the same jack settings and the same interface worked fine on ubuntu 10.04 with approx. 50-70% of dsp load and only very few xruns.
I already found out that ubuntu studio 12.04 seems to have pulseaudio implemented in a different way which causes quite a lot of cpu load. So, completely deinstalling pulseaudio and LADI reduced the dsp load quite a bit but it's still far from being stable causing lots of xruns.
I also tried using kx-studio but it has the same issues.
(av-linux seems to perform better but i can't get my old ardour sessions to work with it)
Does anyone of you know other tricks to increase performance with ubuntu?
Thanks very much!