Re: [LAU] Too many xruns

On 11 October 2012 at 9:17, Kevin Cosgrove <kevinc@email-addr-hidden> wrote:

> On 11 October 2012 at 6:55, Paul Davis <paul@email-addr-hidden> 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
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