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 B45F42013F8; Sat, 3 Dec 2011 01:56:33 -0800 (PST) Received: by iaen33 with SMTP id n33so7945546iae.16 for ; Sat, 03 Dec 2011 01:56:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=ZfMeskF9l/Cc32RGiQ1bSsez8sViuqhmHfVwOFK+gfU=; b=ozeWev8yL0FcrGebd0OzLOiIT1thTxn6tXG0JiUSDutpQ1JHUwXxD9TYLDSrNdgnzX nz0TyftwGchGv2T60lRW51gxLHausF1rIJfzAle+pTmBKKWzhJ+pGUcsHAOZABaIrxFE LGiBx7aADj5xo8H9gdcj9kC900Vyr7X8v9C14= MIME-Version: 1.0 Received: by 10.42.150.135 with SMTP id a7mr1750108icw.53.1322906193149; Sat, 03 Dec 2011 01:56:33 -0800 (PST) Received: by 10.231.204.83 with HTTP; Sat, 3 Dec 2011 01:56:33 -0800 (PST) Date: Sat, 3 Dec 2011 10:56:33 +0100 Message-ID: Subject: Re: [Bloat] Bufferbloat: Dark Buffers in the Internet (ACT II, Scene I) From: Dave Taht To: Jim Reisert AD1C Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: bloat-announce@lists.bufferbloat.net, bloat-devel , bloat@lists.bufferbloat.net X-BeenThere: bloat-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: "Developers working on AQM, device drivers, and networking stacks" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 03 Dec 2011 09:56:34 -0000 Aggh! It's out already? re: http://queue.acm.org/detail.cfm?id=3D2071893 All: This collaboration between Kathie Nichols and JG is a major update, enhancement, revision and replacement of the original 'Dark Buffers' presentations, and contains quite a few new bits of data, several corrections for accuracy, new analogies, some new, clearer plots via Van Jacobson, and a whole lot more. And my own moment of major enlightenment came from... ya know... I'm not gonna tell ya. It's a good piece, well worth reading, even if you think you already understand everything there is to understand about bufferbloat. (hint - see figure 4B and the surrounding paragraphs). Suddenly a whole lot of very fuzzy data made a whole lot of sense to,me. Please pass it along. On Sat, Dec 3, 2011 at 10:08 AM, Jim Reisert AD1C wrote: > Networks without effective AQM may again be vulnerable to congestion coll= apse. > > > 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=3D2071893 > > -- > Jim Reisert AD1C, , http://www.ad1c.us > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat --=20 Dave T=E4ht SKYPE: davetaht US Tel: 1-239-829-5608 FR Tel: 0638645374 http://www.bufferbloat.net