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From: Robert Watson <rwatson@FreeBSD.org>
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To: Barney Cordoba <barney_cordoba@yahoo.com>
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Cc: freebsd-net@freebsd.org, Ivan Voras <ivoras@freebsd.org>
Subject: Re: Advice on a multithreaded netisr  patch?
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On Tue, 7 Apr 2009, Barney Cordoba wrote:

>>> When I enabled LOCK_PROFILING my side modules, such as
>> if_ibg, stopped working. It seems that the ifnet structure or something 
>> changed with that option enabled. Is there a way to sync this without 
>> having to integrate everything into a specific kernel build?
>>
>> LOCK_PROFILING changes the size of lock-related data structures, so 
>> requires both kernel and full set of modules to be rebuilt with the option.
>
> It might be good to mention this in the man page. Most 3rd party drivers 
> build stand-alone, and even if you pull down the latest drivers from intel 
> or broadcom they're usually built out of the kernel build. Its pretty 
> frustrating to have random things failing, mbuf leaks, etc without any 
> warning.

>From the man page:

NOTES
      The LOCK_PROFILING option increases the size of struct lock_object, so a
      kernel built with that option will not work with modules built without
      it.

Robert N M Watson
Computer Laboratory
University of Cambridge