How to probe what application does in kernel (with sound device)?

[Alexander Leidinger]

Quoting Fraser Tweedale <frase at frase.id.au> (from Sat, 14 Jun 2008  
09:55:32 +1000):

> ktrace(1)
>
> From man page:
>      The ktrace utility enables kernel trace logging for the specified pro-
>      cesses.  Kernel trace data is logged to the file ktrace.out.  The kernel
>      operations that are traced include system calls, namei  
> translations, sig-
>      nal processing, and I/O.

To work with linux programs, linux_kdump (ports) has to be used.

Regarding the problem at hand, have a look at vchans (sysctl -a | grep  
vchan). Enable them if they aren't already and test again.

If there are still problems, I suggest to come over to multimedia@,  
post the OS version, the content of /dev/sndstat, the output of  
"sysctl -a | grep linux" and what you tried so far.

Bye,
Alexander.

-- 
Eat drink and be merry!  Tomorrow you may be in Utah.

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