From owner-freebsd-net@FreeBSD.ORG Wed Jul 30 02:39:10 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EE07A106566C for ; Wed, 30 Jul 2008 02:39:10 +0000 (UTC) (envelope-from chris@arnold.se) Received: from mailstore.infotropic.com (mailstore.infotropic.com [213.136.34.3]) by mx1.freebsd.org (Postfix) with ESMTP id 3B3FC8FC17 for ; Wed, 30 Jul 2008 02:39:10 +0000 (UTC) (envelope-from chris@arnold.se) Received: (qmail 15054 invoked by uid 89); 30 Jul 2008 02:12:28 -0000 Received: from sql.infotropic.com (HELO sql) (213.136.34.28) by mailstore.infotropic.com with (DHE-RSA-AES256-SHA encrypted) SMTP; 30 Jul 2008 02:12:28 -0000 Date: Wed, 30 Jul 2008 04:12:27 +0200 (CEST) From: Chris Arnold X-X-Sender: chris@sql.infotropic.com To: "Wilkinson, Alex" In-Reply-To: <20080730020254.GT72093@stlux503.dsto.defence.gov.au> Message-ID: <20080730040811.T70776@sql.infotropic.com> References: <20080730010452.GA856@epsilon.local> <20080730020254.GT72093@stlux503.dsto.defence.gov.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-net@freebsd.org Subject: Re: TCP ECN patch to be committed X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Jul 2008 02:39:11 -0000 On Wed, 30 Jul 2008, Wilkinson, Alex wrote: > 0n Wed, Jul 30, 2008 at 02:04:52AM +0100, Rui Paulo wrote: > > >After some chat with other TCP folks I'm going to commit the TCP ECN patch > >I asked for review a couple months ago with some changes. Most notably is > >the new padding fields added to the syncache struct. > > Um, what is "TCP ECN" ? Nutshell summary please ? > "Explicit Congestion Notification", if negotiated the endpoints in a tcp session can notify eachother of congestion without waiting for dropped packets. This helps in reducing latency and jitter. Short enough? /Chris -- http://www.arnold.se/ http://www.mbit.us/