ok - i had a chance to do a little investigation. Seems that its the stock jackd thats the problem... its just not up to the job.
Here's what I did. 1) installed rt- kernel 2) my soundcard runs as INT-22, so I did chrt -p 99 `pidof "INT-22"` 3) enabled memlock and rtprio in /etc/security/limits.conf @audio soft rtprio 99 @audio hard rtprio 99 @audio - memlock 512000 @audio - nice -19 4) used qjackctl to enable realtime and scheduling priority of 80, as recommended ok - jack now realtimed, as is the soundcard. now to get a test program... i installed libjack-dev and libasound-dev i then got the source distribution for mpg123 v1.4.2 (from sourceforge) ./configure --prefix=/home/richja/mpg123 (configured oss, alsa, jack) make make install now i have mpg123 ( a very performant and lightweight mp3 player) configured for alsa and jack so NOT running jack % mpg123 xxx.mp3 - picks alsa driver - perfect sound - virtually 0 CPU. running jack as above % mpg123 xxx.mp3 - picks jack driver - instantly audible audio drops, jack messages of: "alsa_pcm: xrun of at least 0.007 msecs", delay of 21329.000 usecs exceeds estimated spare time of 10626.000; restart, also clear audio artifacts. totally unusable. hope this gives more info. -- Audio / Video in Hardy is complete joke https://bugs.launchpad.net/bugs/227067 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
