From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-iy0-f171.google.com (mail-iy0-f171.google.com [209.85.210.171]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id BA74F2013F8 for ; Sat, 3 Dec 2011 01:08:27 -0800 (PST) Received: by iaen33 with SMTP id n33so7883743iae.16 for ; Sat, 03 Dec 2011 01:08:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:sender:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=VAGVuUlo81bcwgqUDRYv0AuxLgyj33/fouMqvKH4u/0=; b=A/rXTpOIDA8KlIhD5yXzTHLZylf1KOpJdwXEu02C9rl8l9ZpLXLPJubKXrIV7Vrurh Op1pCnbS4B0gHLnRYKZ37gvQOwNwXyOBOYxZms5oGUN0yQyGdIjmO9k111DBjSH9RpkH 0uecBWlfiO05aQKwkeiQk68p0Pef8qKhYMaGY= MIME-Version: 1.0 Received: by 10.42.137.69 with SMTP id x5mr1748179ict.19.1322903305267; Sat, 03 Dec 2011 01:08:25 -0800 (PST) Sender: jjreisert@gmail.com Received: by 10.42.144.7 with HTTP; Sat, 3 Dec 2011 01:08:25 -0800 (PST) Date: Sat, 3 Dec 2011 02:08:25 -0700 X-Google-Sender-Auth: agVrHJ4W_9D3--GEvrMSnlSRuuo Message-ID: From: Jim Reisert AD1C To: bloat@lists.bufferbloat.net Content-Type: text/plain; charset=ISO-8859-1 Subject: [Bloat] Bufferbloat: Dark Buffers in the Internet 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, 03 Dec 2011 09:08:27 -0000 Networks without effective AQM may again be vulnerable to congestion collapse. Jim Gettys, Bell Labs, Alcatel-Lucent; and Kathleen Nichols, Pollere Inc. Today's networks are suffering from unnecessary latency and poor system performance. The culprit is bufferbloat, the existence of excessively large and frequently full buffers inside the network. Large buffers have been inserted all over the Internet without sufficient thought or testing. They damage or defeat the fundamental congestion-avoidance algorithms of the Internet's most common transport protocol. Long delays from bufferbloat are frequently attributed incorrectly to network congestion, and this misinterpretation of the problem leads to the wrong solutions being proposed. Congestion is an old problem on the Internet, appearing in various forms with different symptoms and causing major problems. Buffers are essential to the proper functioning of packet networks, but overly large, unmanaged, and uncoordinated buffers create excessive delays that frustrate and baffle end users. Many of the issues that create delay are not new, but their collective impact has not been widely understood. Thus, buffering problems have been accumulating for more than a decade. We strive to present these problems with their impacts so that the community can understand and act upon the problem and, we hope, learn to prevent future problems. This article does not claim to be the first to identify the problems of excessive buffering, but is instead intended to create a wider understanding of the pervasive problem and to give a call to action. http://queue.acm.org/detail.cfm?id=2071893 -- Jim Reisert AD1C, , http://www.ad1c.us