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Date: Wed, 16 Jun 2010 14:30:17 +1000
From: Lawrence Stewart <lstewart@freebsd.org>
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To: Igor Sysoev <is@rambler-co.ru>
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Cc: freebsd-net@freebsd.org
Subject: Re: net.inet.tcp.slowstart_flightsize in 8-STABLE
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Hi Igor,

I'm sorry I missed this way back when you sent it.

On 05/12/10 22:47, Igor Sysoev wrote:
> It seems that net.inet.tcp.slowstart_flightsize does not work in 8-STABLE.
> For a long time I used slowstart_flightsize=2 on FreeBSD 4, 6, and 7 hosts.
> However, FreeBSD-8 always starts with the single packet.
> I saw this on different versions of 8-STABLE since 8 Oct 2009 till
> 04 Apr 2010.
>

Can you send me the output of "sysctl net.inet.tcp" from the box in 
question, confirm your method for determining how many packets are 
actually used to start a connection and please describe any symptoms of 
the problem. My guess is delayed acking is causing you some grief?

Cheers,
Lawrence