linuxaudio.org

On 11 October 2012 at 6:55, Paul Davis  wrote:
> 2.  chrt: failed to set pid 0's policy: Operation not permitted

quoted text
> >     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.c...

> >

> >     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

quoted text
>

> 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
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