linuxaudio.org

On 10/19/2012 03:02 PM, Fons Adriaensen wrote:

quoted text
> Hello all,

>

> My ex-collegues at Alcatel are screaming for help. They want to

> run an app (as root, debatable but that's another story) using

> SCHED_FIFO threads on an openSuSE 11.4 system.

>

> Using the 'default' kernel (which has CONFIG_PREEMPT not set),

> this works. Using the 'desktop' kernel (CONFIG_PREEMPT=y) they get

> an EPERM when trying to start a RT thread, even as root.

>

> As I haven't used SuSE for ages, has anyone an idea of what is

> happening here ?

I never used openSuse. and "does not work" is too little info for an

educated guess. So just a few shots in the dark:
/proc/sys/kernel/sched_rt_period_us

/proc/sys/kernel/sched_rt_runtime_us
kernel.sched_rt_runtime_us globally limits realtime

scheduling time.
Maybe cgroups are getting in the way? or possibly grsecurity.
Since it works with the vanilla kernel, PAM and

/etc/security/limits.conf etc do not seem to be the cause, but hey: It

could be related to cgroups, sessions and not su'ing properly.
ciao,

robin

_______________________________________________

Linux-audio-dev mailing list

Linux-audio-dev@lists.linuxaudio.org

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