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To: User Patrice <patrice@idea.dnsalias.net>
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 25 May 2005 14:52:58 -0400
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Cc: freebsd-questions@freebsd.org
Subject: Re: slow download, quick upload
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User Patrice <patrice@idea.dnsalias.net> writes:

> Hello
> 
> answering to myself:
> 
> found that doing a net.inet.tcp.rf1323=0 have multiplied my speed by ten
> 
> net.inet.tcp.rf1323=1     download at 120K/s
> net.inet.tcp.rf1323=0     download at 1.5M/s
> 
> i have tried to adjust windows size, but default value are good.
> 
> I still need help to reach a 5M/s rate which is good enough on a 100MbFdx link

RFC 1323 extensions shouldn't be able to cause that kind of effect.
I'd be suspicious that there's a duplex mismatch on the link; 
are you getting a lot of collisions?