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Date: Tue, 25 Apr 2006 09:35:35 -0400
To: Stephen.Clark@seclark.us, stable@freebsd.org
From: Mike Tancsa <mike@sentex.net>
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Subject: Re: Freebsd Stable 6.x ipsec slower than with 4.9
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At 09:32 AM 25/04/2006, Stephen Clark wrote:
>Hello List,
>
>I have to dualcore Athlon 64 4800+ systems. Initially I was running 
>4.9 on both of them an was able to get 54mbits thru direct connected 
>realtek 10/100 cards as measured by nttcp.
>
>I put stable on one of the system and now can on get 37mbits as 
>measured by nttcp when going thru an ipsec tunnel.

Try first
sysctl -w net.inet.tcp.inflight.enable=0

If its still slower, try using FAST_IPSEC instead on the 
server.  However, make sure you disable INET6

         ---Mike