Re: anybody else OK with current CVS *and* SMP?

[Takashi Iwai <tiwai@suse.de>]

At Tue, 05 Aug 2003 23:37:01 +0300,
Antti Boman wrote:
> 
> This seems like the problem I've always had with my single processor 
> with JACK and SCHED_FIFO, with 2.4.20 kernel. I haven't tried the 
> realtime setting for a while, though.

if the exactly same problem happens on UP, the cause would be
different from what i thought originally.  my guess was spin dead
locks or other SMP-specific issues, possibly around the linked pcm
streams. 

> Maybe there's some other thing causing these? Should we gather a bit 
> more in-depth information on our computers?

yes, this will help.
at least, we need to investigate with the same driver/lib version
(preferably with the same kernel and gcc).

btw, the dead-lock can be related to the lowlevel part, too.
recently i found a bug in es1968 driver which can cause a dead-lock
with linked streams and xrun (typically as jack does).  but in this
case, it can happen regardless of SCHED_FIFO...


Takashi


> 
> -a
> 
> Paul Davis wrote:
> > i am having a repeated problem with system lockups using current CVS
> > with JACK running SCHED_FIFO on an SMP system, with the Planet's
> > 2.4.21 kernel.
> > 
> > can anyone report that a similar configuration is working for them?
> > there is no way to diagnose the situation, because the kernel hangs
> > totally and completely, and its not possible to get the output from
> > either an oops or the magic-request key(s).
> > 
> > it seems to be less of a problem when JACK is running without
> > SCHED_FIFO. 
> > 
> > --p
> 
> 
> 
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