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Date: Wed, 11 Jun 2008 10:31:13 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Ian Smith <smithi@nimnet.asn.au>
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Cc: freebsd-questions@freebsd.org
Subject: Re: firewall high-load performance
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> > is there a way to check on running system how much CPU time is used to
> > perform firewalling/traffic manager - be it pf or ipfw?
>
> Sure, compare ping times / traffic throughput with firewall turned off
> and on?

this will not measure CPU load but delays. delays are unnoticable and 
doesn't look like a problem.