Date: Mon, 09 Feb 1998 09:04:14 -0800 From: David Greenman <dg@root.com> To: Igor.Alekseev@kjeller.fou.telenor.no Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: TCP slow start problem Message-ID: <199802091704.JAA27849@implode.root.com> In-Reply-To: Your message of "Mon, 09 Feb 1998 13:05:47 %2B0100." <"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 >option). > > >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. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe hackers" in the body of the message
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