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 > > 3. Kernel with Real-Time Preemption... not found - not good > > not necessarily relevant. required in cases where the kernel and h/w are > cooperating (badly) to prevent low latency operation, but many people have > systems where this is not required. I'm having IRQ crowding issues, and I was headed at trying to get rtirq going in order to help this. I believe rtirq *does* require an RT kernel. http://wiki.linuxmusicians.com/doku.php?id=system_configuration#rtirq Thanks.... -- Kevin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
