From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hagen Paul Pfeifer Subject: Re: [PATCH] tcp: Increase the initial congestion window to 10. Date: Thu, 03 Feb 2011 15:00:28 +0100 Message-ID: <47859e9273bb0c1b2c32fc1adfa450ee@localhost> References: <20110202.170750.229739784.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: , , To: David Miller Return-path: Received: from alternativer.internetendpunkt.de ([88.198.24.89]:56605 "EHLO geheimer.internetendpunkt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756363Ab1BCOAa (ORCPT ); Thu, 3 Feb 2011 09:00:30 -0500 In-Reply-To: <20110202.170750.229739784.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, 02 Feb 2011 17:07:50 -0800 (PST), David Miller wrote: > +/* TCP initial congestion window */ > +#define TCP_INIT_CWND 10 > + Davem, there is _no_ research how this huge IW will behave in environments with a small BDP. Belief it or not, but there are networks out there with a BDP similar to ~1980. Why for heaven's sake should this work in these environments? There are only _two_ extensive analysis one from Cherry and and one from Ilpo. Both analysis focus on current mainstream BDP. I started to setup a ns-2 environment but due to lack of time I am a little bit behind schedule. Anyway, why not make this a tunable per route knob so that it is easier to fix things, e.g. set IW back to 3. HGN