From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hagen Paul Pfeifer Subject: Re: Raise initial congestion window size / speedup slow start? Date: Thu, 15 Jul 2010 01:01:00 +0200 Message-ID: <20100714230100.GL6682@nuttenaction> References: <4C3E0684.5060409@wildgooses.com> <4C3E1B54.40604@hp.com> <20100714203919.GD6682@nuttenaction> <20100714.145547.102555471.davem@davemloft.net> <20100714221301.GI6682@nuttenaction> <4C3E3F92.2090506@wildgooses.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: David Miller , rick.jones2@hp.com, davidsen@tmr.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: Ed W Return-path: Received: from alternativer.internetendpunkt.de ([88.198.24.89]:44918 "EHLO geheimer.internetendpunkt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757299Ab0GNXBD (ORCPT ); Wed, 14 Jul 2010 19:01:03 -0400 Content-Disposition: inline In-Reply-To: <4C3E3F92.2090506@wildgooses.com> Sender: netdev-owner@vger.kernel.org List-ID: * Ed W | 2010-07-14 23:52:02 [+0100]: >Out of curiousity, why has it taken so long for active feedback to >appear? If every router simply added a hint to the packet as to the >max bandwidth it can offer then we would appear to be able to make >massively better decisions on window sizes. Furthermore routers have >the ability to put backpressure on classes of traffic as appropriate. >I guess the speed at which ECN has been adopted answers the question >of why nothing more exotic has appeared? It is quite late here so I will quickly write two sentence about ECN: one month ago Lars Eggers posted a link at the tcpm maillinglist where google (not really sure if it was google) analysed the employment of ECN - the usage was really low. Search the PDF, it is quite interesting one. Hagen