6.3-PRERELEASE desktop system periodically freezes momentarily

Kris Kennaway kris at FreeBSD.org
Thu Jan 10 12:27:27 PST 2008

Toomas Aas wrote:
> Kris Kennaway wrote:
>> OK.  Can you obtain a lock profiling dump? 
> I'm trying, but not succeeding so far. I added the following to the 
> kernel config:
> options         MUTEX_PROFILING
> options         MPROF_BUFFERS="1536"
> options         MPROF_HASH_SIZE="1543"
> And set debug.mutex.prof.enable=1
> However, kgmon says that profiling is not enabled in the kernel. Am I 
> missing something essential or barking under completely wrong tree?

Yes :)  kgmon has nothing to do with mutex profiling, so remove the MPROF_*.

sysctl debug.mutex.prof.enable=1
... trigger hang ...
sysctl debug.mutex.prof.enable=0

and send me the output of

sysctl debug.mutex.prof.stats


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