Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934595Ab0GOTv2 (ORCPT ); Thu, 15 Jul 2010 15:51:28 -0400 Received: from g6t0184.atlanta.hp.com ([15.193.32.61]:37848 "EHLO g6t0184.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934564Ab0GOTv0 (ORCPT ); Thu, 15 Jul 2010 15:51:26 -0400 Message-ID: <4C3F66BA.8010002@hp.com> Date: Thu, 15 Jul 2010 12:51:22 -0700 From: Rick Jones User-Agent: Mozilla/5.0 (X11; U; HP-UX 9000/785; en-US; rv:1.7.13) Gecko/20060601 X-Accept-Language: en-us, en MIME-Version: 1.0 To: "H.K. Jerry Chu" CC: Bill Fink , Hagen Paul Pfeifer , David Miller , lists@wildgooses.com, davidsen@tmr.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: Raise initial congestion window size / speedup slow start? References: <4C3E0684.5060409@wildgooses.com> <4C3E1B54.40604@hp.com> <20100714203919.GD6682@nuttenaction> <20100714.145547.102555471.davem@davemloft.net> <20100714221301.GI6682@nuttenaction> <20100714234917.924f420d.billfink@mindspring.com> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1271 Lines: 23 I have to wonder if the only heuristic one could employ for divining the initial congestion window is to be either pessimistic/conservative or optimistic/liberal. Or for that matter the only one one really needs here? That's what it comes down to doesn't it? At any one point in time, we don't *really* know the state of the network and whether it can handle the load we might wish to put upon it. We are always reacting to it. Up until now, it has been felt necessary to be pessimistic/conservative at time of connection establishment and not rely as much on the robustness of the "control" part of avoidance and control. Now, the folks at Google have lots of data to suggest we don't need to be so pessimistic/conservative and so we have to decide if we are willing to be more optimistic/liberal. Broadly handwaving, the "netdev we" seems to be willing to be more optimistic/liberal in at least a few cases, and the question comes down to whether or not the "IETF we" will be similarly willing. rick jones -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/