As stated elsewhere in this thread, there's an PF giant-lock.

On Tue 05 Mar 2013 06:40 PM, Brett Glass wrote:
> This brings up a question I hadn't thought to ask before. How SMP-friendly is
> the current implementation of IPFW? I will be building some routers/firewalls
> that will require high performance, and do not want to run into a 
> situation where
> the firewall is single-threaded (or giant-locked) and becomes a bottleneck.
> 
> --Brett Glass

-- 
With kind regards,
Ruud Althuizen

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