On 11 October 2012 at 9:17, Kevin Cosgrove <kevinc@xxxxxxxxxxxx> wrote: > On 11 October 2012 at 6:55, Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx> wrote: > > > 2. chrt: failed to set pid 0's policy: Operation not permitted > > > Checking the ability to prioritize processes with chrt... no - not good > > > Could not assign a 80 rtprio value. Set up limits.conf. > > > For more information, see > > > > > > http://wiki.linuxmusicians.com/doku.php?id=system_configuration#limits.conf > > > > > > I did make the changes outlined at the above link. I still > > > get the above report. I'm going to guess that I need some > > > real-time support from the kernel to make this work. Which > > > brings me to > > > > this is not true. http://jackaudio.org/realtime_vs_realtime_kernel > > OK. That's a pleasant answer. :-) > > I added this: > > :::::::::::::: > /etc/security/limits.d/93-audio_limits.conf > :::::::::::::: > # Increase priority of audio applications > # maximum realtime priority > @audio - rtprio 90 > # maximum locked-in-memory address space (KB) > @audio - memlock 2000000 > > > Fedora's jack-audio-connection-kit-1.9.8-9.fc17.x86_64 package added this: > > :::::::::::::: > /etc/security/limits.d/95-jack.conf > :::::::::::::: > # Default limits for users of jack-audio-connection-kit > > @jackuser - rtprio 70 > @jackuser - memlock 4194304 > > @pulse-rt - rtprio 20 > @pulse-rt - nice -20 > > > you *must* get these permissions correct ... > > By permissions, are you meaning > > crw-rw---- 1 root audio 10, 228 Oct 10 22:47 /dev/hpet > crw-rw---- 1 root audio 254, 0 Oct 10 22:47 /dev/rtc0 > > [kevinc #28] groups > kevinc root adm disk wheel cdrom man floppy games audio users jackuser I enabled real-time jack in qjackctl a bit ago. Then I ran ardour in a play loop for about 40 minutes with ZERO xruns. Yeah! Last night playing ardour for 1 minute would have resulted in several xruns. I was doing this over the network, away from the audio gear. So, I couldn't tell what was happening in the studio. I also need to try recording still. But, this is VERY promising. :-) FWIW, running over the network with the slower screen update rate allowed me to see the "RT" in the qjackctl window flash on/off. I never knew it did that. What does this mean? Thanks... -- Kevin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
