11 Oct
2012
11 Oct
'12
6:50 p.m.
On 11 October 2012 at 9:17, Kevin Cosgrove <kevinc(a)cosgroves.us> wrote:
On 11 October 2012 at 6:55, Paul Davis
<paul(a)linuxaudiosystems.com> wrote:
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
2. chrt: failed to set pid 0's policy:
Operation not permitted
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
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 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