From owner-freebsd-arch@FreeBSD.ORG  Sat Aug 20 14:27:40 2011
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To: Robert Watson <rwatson@FreeBSD.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sat, 20 Aug 2011 12:38:26 +0100."
	<alpine.BSF.2.00.1108201234280.4529@fledge.watson.org>
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Date: Sat, 20 Aug 2011 14:10:59 +0000
Message-ID: <5299.1313849459@critter.freebsd.dk>
Cc: Lev Serebryakov <lev@FreeBSD.org>, freebsd-arch@FreeBSD.org
Subject: Re: 10gbps scalability (was: Re: FreeBSD problems and preliminary
	ways to solve)
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In message <alpine.BSF.2.00.1108201234280.4529@fledge.watson.org>, Robert Watso
n writes:

>Part of the key here will be reworking things like ipfw(4) 

Here is how to do it:

Compile IPFW rules to C-code, compile C-code to KLD, load KLD and hook
the firewall rules.

If the C-code is designed smartly, the C-compiler can optimize to
insanely efficient code.

The same semantics as today can be preserved with respect to counters
and dynamic addition/removal of rules, with a little bit of creative
thinking about data structures.

Somebody[tm] did that long ago, but never contributed the patches back
once The Mgt[tm] realized what performance we were talking about.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.