From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from tuna.sandelman.ca (unknown [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) by huchra.bufferbloat.net (Postfix) with ESMTP id 74F95208AC3 for ; Sat, 1 Dec 2012 12:53:45 -0800 (PST) Received: from obiwan.sandelman.ca (desk.marajade.sandelman.ca [209.87.252.247]) by tuna.sandelman.ca (Postfix) with ESMTP id 579722016E; Sat, 1 Dec 2012 15:55:45 -0500 (EST) Received: by obiwan.sandelman.ca (Postfix, from userid 179) id CC8F763A8E; Sat, 1 Dec 2012 15:53:13 -0500 (EST) Received: from obiwan.sandelman.ca (localhost [127.0.0.1]) by obiwan.sandelman.ca (Postfix) with ESMTP id B416263A26; Sat, 1 Dec 2012 15:53:13 -0500 (EST) From: Michael Richardson To: Mark Watson In-Reply-To: <15815375-7E44-42DE-AE49-6630A053B88B@netflix.com> References: <15815375-7E44-42DE-AE49-6630A053B88B@netflix.com> X-Mailer: MH-E 8.3; nmh 1.3-dev; XEmacs 21.4 (patch 22) X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m Sender: mcr@obiwan.sandelman.ca Cc: Dauran raza , "" , "" Subject: Re: [Bloat] Bufferbloat research: Help required X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Dec 2012 20:53:46 -0000 >>>>> "Mark" == Mark Watson writes: Mark> It's also interesting to note that cellular wireless [DATA] systems Mark> have been designed with a primary objective of reducing packet Mark> loss, at the expense of delay and especially delay variability Mark> introduced by link layer ARQ and other schemes. This approach Mark> maximizes the throughput of a single long-lived TCP Mark> connection, which is not an especially common traffic Mark> pattern. A question, given that I inserted [DATA]. I wonder to what extent the pre-LTE systems were designed this way in part to make sure that voice over data would always be crappy? The LTE roadmap says that voice is now over data, so it's now in the carrier's interest to do things differently. Mark> Furthermore, the throughput of a cellular wireless radio Mark> channel varies by orders of magnitude on fairly rapidly Mark> (channel conditions are reassessed hundreds of times per Mark> second): what was a reasonable sized buffer for the throughput Mark> at one moment becomes a bloated one a fraction of a second Mark> later. Does ECN help us here? -- ] He who is tired of Weird Al is tired of life! | firewalls [ ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[ ] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[ Kyoto Plus: watch the video then sign the petition.