FreeBSD tuning

Is anyone out there running FreeBSD 8 with the server tuning parameters 
outlined in:
http://www.stalker.com/cgatepro/Scalability.html#FreeBSD

We're running into a default thread limit and are wondering if all/some 
of those recommendations still stand.  The recommendations were made for 
FreeBSD 5 and some of the new defaults seem to what the previous 
recommendations were [or more/less depending on the parameter].

Basically, can we increase the kern.threads.max_threads_per_proc by 
itself or does some other parameter depend on it [such as 
kern.maxfilesperproc]?

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