Am 02.02.2012 23:47, schrieb mn0: > As we know now, the shared IRQs were not causing the xruns. > Just to make sure, everyone's up to date: > -using 2 Delta 1010s together. > -Core2duo E4500 > -Ubuntustudio 10.04 > -kxstudio repos > -jackdmp 1.9.9. from svn > -The cards are hardware synced via S-PDIF. > In envy24control, a mixer program that knows about these features, hw:0 > is set to internal clock and hw:1 is set to S-PDIF. > -using a real S-PDIF cable and not > just an audio RCA cable. > -use .asoundrc. > -cat /proc/asound/cards finds both. > -onboard sound card disabled. > -I know which device represents which hardware card. Thus S-PDIF > direction is correct (re-checked 5 min ago). > -use QJackCtl: /usr/bin/jackd -P89 -v -dalsa -r48000 -p256 -n4 -m -D > -Cmulti_capture -Pmulti_playback > -other frames/period, Priority etc. settings don't help. > -tried on 2.6.33.xx-realtime and 2.6.31.yy-rt kernels. > -in QjackCtl xruns=x(y); > y is growing rapidly (~300/gui update). > I found out, that y represents the xruns reported by jack api, while x > is scraped from the logs. So y are real xruns. > -jack is running with rt priority. > -in limits.conf audio group has unlimited memory, is -20 nice and has 89 > rtprio. > > > > interesting side effect: > on 2.6.32-27-generic, the xruns don't occur so often. > with-p512 there's even no xruns. > > What's going on there? > Kernel issue? > -p512 is a little too much latency. > Why is a generic kernel xrunning less than a realtime or rt? > jack 1.9.9 compatibility issue? > > /mn0 > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user > Just in case you want to know, how I fixed it... Thought, maybe kernels from the early stone age are bad... installed 2.6.38 lowlatency. Didn't help... but when attempting to start jack, it complained a certain pid was using the soundcard. ps alx said it was - guess what - pulseaudio... created ~/.pulse/client.conf with the following content: autospawn = no pulseaudio -k start jack smile. Now running without xruns at /usr/bin/jackd -P89 -v -dalsa -r48000 -p128 -n4 -m -D -Cmulti_capture -Pmulti_playback and very few on -n3 So I'm sorry for making such a noise on the list and happy it's now working as supposed to. /mn0 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
