linuxaudio.org

2009/2/14 Emanuel Rumpf :

quoted text
>

> My problem:

> jack doesn't start with the real-time option enabled - output:

>

> JACK compiled with System V SHM support.

> cannot use real-time scheduling (FIFO at priority 10) [for thread

> -1210911056, from thread -1210911056] (1: Operation not permitted)

>

Ah ... fine !

At LAU-ML, I found a message (02.02.2009) by Robin Gareus,

which solves the problem:
`echo -1 > /proc/sys/kernel/sched_rt_runtime_us`
or edit /etc/sysctl.conf and add:

kernel.sched_rt_runtime_us = -1
and his comment:

"""

indeed, jackd did not start unless run as root or until I changed

/proc/sys/kernel/sched_rt_runtime_us
It's the us (or .001% of CPU usage?!) above which FIFO and RR will be

throttled to recover from a run-away rt process. - I'm not exactly sure

why it affects jackd when run as "normal" user; maybe because with CPU

load above the default 95% rt can not be guaranteed.
There's a bit [off topic] but enlightening info at

http://kerneltrap.org/mailarchive/linux-kernel/2008/8/16/2960524
"""
Thanks
--

Emanuel Rumpf

_______________________________________________

Linux-audio-tuning mailing list

Linux-audio-tuning@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-tuning