I get the same high frequecy of xruns both with -p 1024 and 2048: 22:06:19.818 Patchbay deactivated. 22:06:19.953 Statistics reset. 22:06:20.126 MIDI connection graph change. 22:06:20.286 MIDI connection change. 22:07:01.574 Startup script... 22:07:01.574 artsshell -q terminate 22:07:02.935 Startup script terminated with exit status=256. 22:07:03.017 JACK is starting... 22:07:03.018 jackd -R -P7 -u -dalsa -r44100 -p1024 -n2 -D -Chw:0 -Phw:0 22:07:03.047 JACK was started with PID=9622 (0x2596). jackd 0.101.1 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. loading driver .. apparent rate = 44100 creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit control device hw:0 configuring for 44100Hz, period = 1024 frames, buffer = 2 periods nperiods = 2 for capture nperiods = 2 for playback **** alsa_pcm: xrun of at least 0.017 msecs **** alsa_pcm: xrun of at least 0.015 msecs **** alsa_pcm: xrun of at least 0.018 msecs **** alsa_pcm: xrun of at least 0.016 msecs **** alsa_pcm: xrun of at least 0.011 msecs **** alsa_pcm: xrun of at least 0.014 msecs 22:07:05.146 Server configuration saved to "/home/d135-1r43/.jackdrc". 22:07:05.148 Statistics reset. 22:07:05.796 Client activated. 22:07:05.798 Audio connection change. 22:07:05.802 Audio connection graph change. 22:07:05.802 XRUN callback (1). **** alsa_pcm: xrun of at least 0.019 msecs **** alsa_pcm: xrun of at least 0.019 msecs **** alsa_pcm: xrun of at least 0.022 msecs **** alsa_pcm: xrun of at least 41.788 msecs **** alsa_pcm: xrun of at least 0.017 msecs **** alsa_pcm: xrun of at least 0.014 msecs **** alsa_pcm: xrun of at least 0.011 msecs **** alsa_pcm: xrun of at least 0.018 msecs **** alsa_pcm: xrun of at least 0.013 msecs **** alsa_pcm: xrun of at least 0.012 msecs 22:07:07.701 XRUN callback (8). 22:07:07.837 XRUN callback (7 skipped). **** alsa_pcm: xrun of at least 0.018 msecs **** alsa_pcm: xrun of at least 0.016 msecs **** alsa_pcm: xrun of at least 0.012 msecs **** alsa_pcm: xrun of at least 0.011 msecs 22:07:09.869 XRUN callback (3 skipped). **** alsa_pcm: xrun of at least 0.020 msecs **** alsa_pcm: xrun of at least 0.011 msecs 22:07:10.376 Client deactivated. 22:07:10.377 JACK is stopping... jack main caught signal 15 no message buffer overruns 22:07:10.717 JACK was stopped successfully. 22:07:10.718 Post-shutdown script... 22:07:10.719 killall jackd jackd: no process killed 22:07:11.086 Post-shutdown script terminated with exit status=256. 22:08:22.296 Startup script... 22:08:22.297 artsshell -q terminate 22:08:22.867 Startup script terminated with exit status=256. 22:08:22.868 JACK is starting... 22:08:22.868 jackd -R -P7 -u -dalsa -r44100 -p2048 -n2 -D -Chw:0 -Phw:0 22:08:22.874 JACK was started with PID=9631 (0x259f). jackd 0.101.1 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. loading driver .. apparent rate = 44100 creating alsa driver ... hw:0|hw:0|2048|2|44100|0|0|nomon|swmeter|-|32bit control device hw:0 configuring for 44100Hz, period = 2048 frames, buffer = 2 periods nperiods = 2 for capture nperiods = 2 for playback **** alsa_pcm: xrun of at least 0.015 msecs **** alsa_pcm: xrun of at least 0.015 msecs **** alsa_pcm: xrun of at least 0.016 msecs **** alsa_pcm: xrun of at least 0.015 msecs **** alsa_pcm: xrun of at least 0.019 msecs 22:08:24.927 Server configuration saved to "/home/d135-1r43/.jackdrc". 22:08:24.928 Statistics reset. 22:08:24.931 Client activated. 22:08:24.932 Audio connection change. 22:08:24.935 Audio connection graph change. **** alsa_pcm: xrun of at least 0.017 msecs 22:08:25.686 XRUN callback (1). **** alsa_pcm: xrun of at least 0.029 msecs **** alsa_pcm: xrun of at least 0.028 msecs **** alsa_pcm: xrun of at least 0.012 msecs **** alsa_pcm: xrun of at least 0.013 msecs 22:08:26.970 XRUN callback (4 skipped). **** alsa_pcm: xrun of at least 0.020 msecs **** alsa_pcm: xrun of at least 0.013 msecs **** alsa_pcm: xrun of at least 0.017 msecs 22:08:28.870 XRUN callback (8). 22:08:29.002 XRUN callback (2 skipped). **** alsa_pcm: xrun of at least 0.027 msecs **** alsa_pcm: xrun of at least 0.012 msecs **** alsa_pcm: xrun of at least 0.010 msecs 22:08:31.042 XRUN callback (2 skipped). **** alsa_pcm: xrun of at least 0.019 msecs 22:08:31.310 XRUN callback (12). 22:08:31.745 Client deactivated. 22:08:31.746 JACK is stopping... jack main caught signal 15 no message buffer overruns 22:08:32.001 JACK was stopped successfully. 22:08:32.003 Post-shutdown script... 22:08:32.003 killall jackd jackd: no process killed 22:08:32.215 Post-shutdown script terminated with exit status=256. DuWayne Holsbeck wrote: _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user

I measured it 3 times to get an idea of the average: # hdparm -t /dev/sda1 /dev/sda1: Timing buffered disk reads: 52 MB in 3.04 seconds = 17.12 MB/sec # hdparm -t /dev/sda1 /dev/sda1: Timing buffered disk reads: 50 MB in 3.17 seconds = 15.79 MB/sec # hdparm -t /dev/sda1 /dev/sda1: Timing buffered disk reads: 100 MB in 2.98 seconds = 33.55 MB/sec _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user

On Thursday 14 June 2007, Markus Herhoffer wrote: Additionally to the other comments? Do you have capturing enabled in alsamixer? If not i heard the HDA driver behaves a bit odd ;) Flo