From owner-freebsd-questions@FreeBSD.ORG Thu Aug 26 10:04:19 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 87A7616A4CE for ; Thu, 26 Aug 2004 10:04:19 +0000 (GMT) Received: from smtp.infracaninophile.co.uk (ns0.infracaninophile.co.uk [81.2.69.218]) by mx1.FreeBSD.org (Postfix) with ESMTP id BA8C143D1D for ; Thu, 26 Aug 2004 10:04:18 +0000 (GMT) (envelope-from m.seaman@infracaninophile.co.uk) Received: from happy-idiot-talk.infracaninophile.co.uk (localhost [IPv6:::1]) i7QA30xM028757 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 26 Aug 2004 11:03:00 +0100 (BST) (envelope-from matthew@happy-idiot-talk.infracaninophile.co.uk) Received: (from matthew@localhost)id i7QA2xu2028756; Thu, 26 Aug 2004 11:02:59 +0100 (BST) (envelope-from matthew) Date: Thu, 26 Aug 2004 11:02:59 +0100 From: Matthew Seaman To: wilsonb Message-ID: <20040826100259.GE87719@happy-idiot-talk.infracaninophile.co.uk> Mail-Followup-To: Matthew Seaman , wilsonb , FreeBSD Contact References: <20040826054613.M65704@cs.wits.ac.za> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="h56sxpGKRmy85csR" Content-Disposition: inline In-Reply-To: <20040826054613.M65704@cs.wits.ac.za> User-Agent: Mutt/1.5.6i X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-1.5.6 (smtp.infracaninophile.co.uk [IPv6:::1]); Thu, 26 Aug 2004 11:03:00 +0100 (BST) X-Virus-Scanned: clamd / ClamAV version devel-20040705, clamav-milter version 0.74a on smtp.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, hits=-4.8 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=2.64 X-Spam-Checker-Version: SpamAssassin 2.64 (2004-01-11) on happy-idiot-talk.infracaninophile.co.uk cc: FreeBSD Contact Subject: Re: FreeBSD 4.9 and TCP X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Aug 2004 10:04:19 -0000 --h56sxpGKRmy85csR Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 26, 2004 at 07:54:21AM +0200, wilsonb wrote: > 1) Which versions of TCP does the FreeBSD 4.9 distribution support and > implement -- we need to use TCP Reno, NewReno, Tahoe, SACK and T/TCP in o= ur > experiments. SACK is not available in 4.9 -- although it is available in recent 5.x. I've seen mention of a possible MFC of code to support SACK, but as far as I'm aware, that hasn't happened yet. In any case, once MFC'd, you'ld have to upgrade to 4.10-STABLE to get it. Actually, for the purposes of experimentation you'ld probably be better off running a recent 5.3-CURRENT or 6.0-CURRENT, although take note of the warnings about WITNESS and INVARIANTS in /usr/src/UPDATING, and how they affect performance. I think all of the other features are available -- typically you'ld use net.inet.tcp sysctls to turn them on or off: see the tcp(4), ttcp(4) man pages for details. Another good approach is just to grep(1) through the kernel source code for interesting strings, and read the comments, if not the code itself. Cheers, Matthew --=20 Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks Savill Way PGP: http://www.infracaninophile.co.uk/pgpkey Marlow Tel: +44 1628 476614 Bucks., SL7 1TH UK --h56sxpGKRmy85csR Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (FreeBSD) iD8DBQFBLbVTiD657aJF7eIRAnCpAKCqevnFNdEtU/30J4QRkxqZgvYeMwCgkTh2 /DG+naWc5RPq/sF65XuK2T8= =DNNd -----END PGP SIGNATURE----- --h56sxpGKRmy85csR--