From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 26 Jan 2001 12:06:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 26 Jan 2001 12:06:13 -0500 Received: from 041imtd176.chartermi.net ([24.247.41.176]:46479 "EHLO oof.netnation.com") by vger.kernel.org with ESMTP id ; Fri, 26 Jan 2001 12:06:05 -0500 Date: Fri, 26 Jan 2001 12:05:56 -0500 From: Simon Kirby To: linux-kernel@vger.kernel.org Subject: ECN Message-ID: <20010126120556.A13417@stormix.com> In-Reply-To: <20010126124426.O2360@marowsky-bree.de> <20010126154447.L3849@marowsky-bree.de> <20010126160342.B7096@pcep-jamie.cern.ch> <14961.37986.469902.496834@pizda.ninka.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.12i In-Reply-To: <14961.37986.469902.496834@pizda.ninka.net>; from davem@redhat.com on Fri, Jan 26, 2001 at 07:14:42AM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 26, 2001 at 07:14:42AM -0800, David S. Miller wrote: > Jamie Lokier writes: > > Does ECN provide perceived benefits to the node using it? > > Yes, endpoints and intermediate routers can tell the TCP sender about > congestion instead of TCP having to guess about it based upon observed > packet drop. > > It is a major enhancement to performance over any WAN. > > The endpoint based congestion notification happens _now_ if both > sides speak ECN. The router based notification will be happening > in the near future as Cisco and others deploy ECN speaking versions of > their router software. Hmm... Just wondering: what does TCP then do when it receives this ECN notification? Try harder, try less? Or does it get a specific packet saying "I dropped your packet", and then the sender retransmits? I suppose I could go find the RFC... Simon- [ Stormix Technologies Inc. ][ NetNation Communications Inc. ] [ sim@stormix.com ][ sim@netnation.com ] [ Opinions expressed are not necessarily those of my employers. ] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/