Re: CONFIG_PREEMPT and server workloads

[Valdis . Kletnieks]

On Thu, 18 Mar 2004 14:24:59 EST, Robert Love said:
> On Thu, 2004-03-18 at 14:08, Takashi Iwai wrote:
> 
> > oh, sorry, maybe i forgot to tell you that it has been already there
> > :)
> > 
> > 	# echo 1 > /proc/asound/card0/pcm0p/xrun_debug
> > 
> > this will show the stacktrace when a buffer overrun/underrun is
> > detected in the irq handler.  it's not perfect, though.
> 
> Excellent!
> 
> Has this resulted in anything useful?
> 
> With KALLSYMS=y, a lot of users now become intelligent bug testers.
> 
> Eh, except that I do not have that procfs entry on my system..

Is one of these yours?  My machine has 3 (but only one soundcard) ;)

%  find /proc/asound/ -name xrun_debug -ls
  4480    0 -r--r--r--   1 root     root            0 Mar 19 16:00 /proc/asound/card0/pcm1c/xrun_debug
  4470    0 -r--r--r--   1 root     root            0 Mar 19 16:00 /proc/asound/card0/pcm0c/xrun_debug
  4462    0 -r--r--r--   1 root     root            0 Mar 19 16:00 /proc/asound/card0/pcm0p/xrun_debug

(Are these 3 different controls, or 3 places to set the same variable?)

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