> Debian testing current libpam-modules 0.79-4 supports rtprio (I use it). > To be sure just run : > > jackd -R -P 70 -d dummy > > in another shell launch : > > top -H -p `pidof jackd` > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 26812 moino 18 0 21652 21m 3892 S 0 2.1 0:00.01 jackd > 26813 moino 18 0 21652 21m 3892 S 0 2.1 0:00.00 jackd > 26814 moino 19 0 21652 21m 3892 S 0 2.1 0:00.00 jackd > 26815 moino -81 0 21652 21m 3892 S 0 2.1 0:00.00 jackd > 26816 moino *-71* 0 21652 21m 3892 S 0 2.1 0:00.00 jackd > > If rlimit is not working you won't see a thread at prio -71 > Don't be afraid if you don't have the thread at -81 you must have an > old version of jackd. > > If you can verify this you can be sure your problem does not come from > rlimit or realtime stuff. > You will have to investigate more. > > Goood luck. > > PS. If you have a dual core setup I'm not sure your jackd version is patched > against some hw clock drift problems. Do you have the --clocksource > option when you launch jackd -h ? > > David. Hi, thank you for your answer. rlimits seem to work, becasue i got the same results as mentioned above. In fact i have a Centrino Duo (Dual Core) notebook, so this might be the reason fpr my xruns and stuttering sound? If i run jackd -h i got no option mention --clocksource. What can i do next? Thank you, Julian