[LAU] unable to set scheduling priority with rt kernel

[Chuckk Hubbard]

Hi doc, thanks for the guess.  sudo chrt does work, though.  I'm supposed to
not need it with the rt-patched kernel, which allows non-root users to set
high priorities.
-Chuckk


On 10/24/07, Dragan Noveski <perodog at gmx.net> wrote:
>
> chuckk, i can only try to guess.
> perhaps sudo on your system is not allowed to do chrt?
> on my system i have the file /etc/sudoers containing this two important
> lines:
>
> root    ALL=(ALL) ALL
> nowhiskey       ALL=NOPASSWD: ALL
>
> don't know if it could be the root of the problem, because if so, i
> would expect something like 'operation not permitted' error, but who
> knows.
>
>
> cheers,
> doc
> >
> > My kernel has:
> > # CONFIG_PREEMPT_NONE is not set
> > # CONFIG_PREEMPT_VOLUNTARY is not set
> > # CONFIG_PREEMPT_DESKTOP is not set
> > CONFIG_PREEMPT_RT=y
> > CONFIG_PREEMPT=y
> > CONFIG_PREEMPT_SOFTIRQS=y
> > CONFIG_PREEMPT_HARDIRQS=y
> > CONFIG_PREEMPT_BKL=y
> > # CONFIG_CLASSIC_RCU is not set
> > CONFIG_PREEMPT_RCU=y
> >
> > /etc/security/limits.conf has:
> > @audio         -     nice         -10
> > @audio         -     rtprio         99
> > @audio         -     memlock     4000000 (someone on the jack list
> > suggested that my previous value "unlimited" was not recognized, so I
> > stuck this in but no change)
> >
> > and user "chuckk" is in group "audio".
> >
> > Lastly, the output from my script when the second sudo chrt line is
> > commented out:
> > ------------------------------
> > pid 684's current scheduling policy: SCHED_FIFO
> > pid 684's current scheduling priority: 82
> > jackd 0.103.0
> > Copyright 2001-2005 Paul Davis and others.
> > jackd comes with ABSOLUTELY NO WARRANTY
> > This is free software, and you are welcome to redistribute it
> > under certain conditions; see the file COPYING for details
> >
> > JACK compiled with System V SHM support.
> > pid 5132's current scheduling policy: SCHED_OTHER
> > pid 5132's current scheduling priority: 0
> > loading driver ..
> > Enhanced3DNow! detected
> > SSE2 detected
> > apparent rate = 44100
> > creating alsa driver ... hw:0|-|256|2|44100|0|0|nomon
> > |swmeter|-|32bit
> > control device hw:0
> > configuring for 44100Hz, period = 256 frames, buffer = 2 periods
> > ALSA: final selected sample format for playback: 32bit little-endian
> > ALSA: use 2 periods for playback
> >
> > --------------------------------------
> >
> > Any ideas what I may have missed or misconfigured?
> >
> > Thanks!
> > -Chuckk
> >
> >
> > --
> > http://www.badmuthahubbard.com
> > ------------------------------------------------------------------------
> >
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> >
>
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