From owner-freebsd-current@FreeBSD.ORG Mon Mar 8 12:22:19 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 096DC16A4CE; Mon, 8 Mar 2004 12:22:19 -0800 (PST) Received: from odin.ac.hmc.edu (Odin.AC.HMC.Edu [134.173.32.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id E096043D3F; Mon, 8 Mar 2004 12:22:18 -0800 (PST) (envelope-from brdavis@odin.ac.hmc.edu) Received: from odin.ac.hmc.edu (IDENT:brdavis@localhost.localdomain [127.0.0.1]) by odin.ac.hmc.edu (8.12.10/8.12.3) with ESMTP id i28KMBRH032346; Mon, 8 Mar 2004 12:22:11 -0800 Received: (from brdavis@localhost) by odin.ac.hmc.edu (8.12.10/8.12.3/Submit) id i28KMAJc032345; Mon, 8 Mar 2004 12:22:10 -0800 Date: Mon, 8 Mar 2004 12:22:10 -0800 From: Brooks Davis To: Kevin Oberman Message-ID: <20040308202210.GB485@Odin.AC.HMC.Edu> References: <404BA723.C8141806@freebsd.org> <20040308182431.4FA6D5D08@ptavv.es.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="9zSXsLTf0vkW971A" Content-Disposition: inline In-Reply-To: <20040308182431.4FA6D5D08@ptavv.es.net> User-Agent: Mutt/1.5.4i X-Virus-Scanned: by amavisd-milter (http://amavis.org/) on odin.ac.hmc.edu cc: David Malone cc: freebsd-net@freebsd.org cc: freebsd-current@freebsd.org cc: Andre Oppermann Subject: Re: My planned work on networking stack X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Mar 2004 20:22:19 -0000 --9zSXsLTf0vkW971A Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 08, 2004 at 10:24:31AM -0800, Kevin Oberman wrote: > > Date: Sun, 07 Mar 2004 23:50:11 +0100 > > From: Andre Oppermann > > Sender: owner-freebsd-current@freebsd.org > >=20 > > David Malone wrote: > > >=20 > > > On Mon, Mar 01, 2004 at 11:18:34PM +0100, Andre Oppermann wrote: > > > > [] automatically sizing TCP send buffers to achieve optimal perfor= mance > > > > over a wide range of bw*delay situations. (in progress) > > >=20 > > > Hi Andre, > > >=20 > > > This reminded me - do you know what happened to the plan to implement > > > SACK for FreeBSD? I'm working with a research group that's interested > > > in new high speed TCP techniques and they'd prefer to work with > > > FreeBSD, but they've been using Linux 'cos they need SACK. They > > > might actually be interested in spending some time implementing it, > > > if we weren't going to be clashing with anytone else. > >=20 > > I don't know of any current project or effort to implement SACK on > > FreeBSD. It is not on my todo list and it doesn't fit there. But > > I'm available if someone wants to discuss specifics and implementation > > details. >=20 > I know that our organization would love to see SACK. Much of the > high-performance network development that used to be on FreeBSD has > moved to Linux simply because SACK is essential. You can't run > trans-oceanic TCP streams of gigabit or more throughput without it. >=20 > Unfortunately, SACK is often looked upon as a waste of effort to those > who use nets in more commercial forms where aggregation of lots of small > streams is how fat pipes are used. Research big science are about the > only ones who have a real need for this kind of performance and it's > growing fast. Without SACK, FreeBSD will be a non-starter for these > purposes.=20 I've got a co-worker who is part of a research group at ISI that is doing research on long fat pipes with large streams. They are intrested in doing a SACK implementation. I hope to have some more information later this week. -- Brooks --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --9zSXsLTf0vkW971A Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFATNXxXY6L6fI4GtQRAkfvAKDeRdh5gkJpod6C9kONe1WLloyCggCff4Bu PTTvFgTZfFHay+9RqI3DbC8= =2l/m -----END PGP SIGNATURE----- --9zSXsLTf0vkW971A--