fc2, xorg, 2.6.x, scheduling latency peaks

Arjan van de Ven arjanv at redhat.com
Wed Jun 2 18:34:59 UTC 2004


On Wed, Jun 02, 2004 at 11:28:20AM -0700, Fernando Pablo Lopez-Lezcano wrote:
> > > > A real test with the Jack low latency server reveals that something else
> > > > is creating latency hits.
> > > 
> > > do you run Jack as realtime process ??
> > 
> > Correct, it is running SCHED_FIFO. I'm using Jack O'Quin LSM realcap
> > module to grant non-root users those privileges (compiled as a module in
> > the kernel). 
> > 
> > Just occured to me, is there anything else in FC2 that may be running
> > SCHED_FIFO?? I'll try to find out. 
> 
> Using schedutils (chrt) I find no tasks or threads running SCHED_FIFO.
> And the realtime threads of jack are apparently running SCHED_FIFO.
> Argh, that would have been too easy :-)

can you try to NOT run it realtime? Sounds odd but when you use realtime
behavior you have to be really careful for priority inversion situations (eg
if X doesn't run at such a high prio, but your RT task needs to wait on X to
draw something..)
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