From owner-freebsd-net@FreeBSD.ORG Tue Mar 9 11:25:31 2004 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3F26316A4CE; Tue, 9 Mar 2004 11:25:31 -0800 (PST) Received: from vhost109.his.com (vhost109.his.com [216.194.225.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1851143D46; Tue, 9 Mar 2004 11:25:30 -0800 (PST) (envelope-from brad.knowles@skynet.be) Received: from [10.0.1.4] (localhost.his.com [127.0.0.1]) by vhost109.his.com (8.12.6p3/8.12.3) with ESMTP id i29JPFxg084340; Tue, 9 Mar 2004 14:25:25 -0500 (EST) (envelope-from brad.knowles@skynet.be) Mime-Version: 1.0 X-Sender: bs663385@127.0.0.1 Message-Id: In-Reply-To: <200403082325.i28NPAa3010399@mtaw6.prodigy.net> References: <200403082325.i28NPAa3010399@mtaw6.prodigy.net> Date: Tue, 9 Mar 2004 20:13:11 +0100 To: Jeffrey Hsu From: Brad Knowles Content-Type: text/plain; charset="us-ascii" ; format="flowed" cc: freebsd-net@freebsd.org cc: freebsd-current@freebsd.org Subject: Re: Who wants SACK? (Re: was My planned work on networking stack) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Mar 2004 19:25:31 -0000 At 3:32 PM -0800 2004/03/08, Jeffrey Hsu wrote: > What Luigi says is absolutely correct. It doesn't take a lot to > get this done. I've talked to a number of companies about implementing > SACK for them and while there was interest, no one wanted to fund > it all themselves, potentially for the benefit of their competitors. Out of curiosity, can someone provide some pointers as to where SACK really helps? Is this just for high-speed WANs and doesn't help on LANs, or is it useful in both contexts? Also, at what speeds/packet sizes does SACK start to become really useful? I'm just wondering if there aren't a lot of people who could benefit from something like this, only they don't know it. If they were to find out, it might help provide funding and other resources to spur development. -- Brad Knowles, "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+ !w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++) tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)