Date: Fri, 13 Apr 2001 08:22:13 -0700 From: bmah@cisco.com (Bruce A. Mah) To: Julian Elischer <julian@elischer.org> Cc: Toni SOUEID <djt2000@inco.com.lb>, freebsd-bugs@FreeBSD.ORG, freebsd-net@FreeBSD.ORG Subject: Re: Problem in TCP initialisation of cwnd Message-ID: <200104131522.f3DFMDB24703@bmah-freebsd-0.cisco.com> In-Reply-To: <3AD711EE.EEADD293@elischer.org> References: <000901c0c422$bd356860$941f7ec2@hamster> <3AD711EE.EEADD293@elischer.org>
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--==_Exmh_423415747P Content-Type: text/plain; charset=us-ascii If memory serves me right, Julian Elischer wrote: > > One thing that shocked me is that a TCP connection in FreeBSD (at least on > > my machines) > > doesn't begin with a slow start but rather sends a huge amount of packets t > o > > the other end > > (this huge amount only seems to be limited either by the receiver window or > > by the local machine's > > send buffer). It seems that cwnd isn't initialised. > > It is my understanding that it does this only if the destination is considere > d > 'local' > (i.e in the same subnet.) This is my recollection too, but I can't off-hand recall the reference for this (other than looking in the source code). I'm betting that these sysctl variables let one tweak this behavior: net.inet.tcp.slowstart_flightsize: 1 net.inet.tcp.local_slowstart_flightsize: 65535 Bruce. --==_Exmh_423415747P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.4 (FreeBSD) Comment: Exmh version 2.2 06/23/2000 iD8DBQE61xml2MoxcVugUsMRAqTlAKCT0/EfzRehcO13iQJ31nZF9mXIdQCgjl2B uLSjGAmZYYPXBPZjqHS/XdE= =YW0/ -----END PGP SIGNATURE----- --==_Exmh_423415747P-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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