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Date:      Mon, 09 Feb 1998 09:04:14 -0800
From:      David Greenman <>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: TCP slow start problem 
Message-ID:  <>
In-Reply-To: Your message of "Mon, 09 Feb 1998 13:05:47 +0100." <"1658 98/02/09 13:05*/G=Igor/S=Alekseev/OU=kjeller/O=fou/PRMD=telenor/ADMD=TELEMAX/C=no/"@MHS> 

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>FreeBSD 2.2.5 seems not to be following Slow start procedure (when connection is 
>set up)!
>Could someone, please shed some light on this problem?
>The /sys/netinet/tcp_subr.c file contains a function tcp_newtcpcb() which initialises 
>the control block structure. This function initialises congerstion window (CWND) 
>tp->snd_cwnd to the maximum possible window size (evwn with window scale 
>tcp_subr.c line 280:  tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;

   The congestion window is also set in tcp_mss() as soon as the mss is
learned from the foreign machine, and for non-local networks, cwnd is
set to one segment.


David Greenman
Core-team/Principal Architect, The FreeBSD Project

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