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Date: Thu, 10 Jan 2008 21:27:25 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Toomas Aas <toomas.aas@raad.tartu.ee>
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Cc: freebsd-stable@freebsd.org, Wayne Sierke <ws@au.dyndns.ws>
Subject: Re: 6.3-PRERELEASE desktop system periodically freezes momentarily
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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

Kris