From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from fruitcake.ICSI.Berkeley.EDU (fruitcake.ICSI.Berkeley.EDU [192.150.186.11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 5316B21F1A6 for ; Tue, 8 Jan 2013 21:32:35 -0800 (PST) Received: from lawyers.icir.org (envoy.icir.org [192.150.187.30]) by fruitcake.ICSI.Berkeley.EDU (8.12.11.20060614/8.12.11) with ESMTP id r095WTCN020540; Tue, 8 Jan 2013 21:32:29 -0800 (PST) Received: from lawyers.icir.org (localhost [127.0.0.1]) by lawyers.icir.org (Postfix) with ESMTP id 2D0315B3C59; Wed, 9 Jan 2013 00:32:28 -0500 (EST) To: David Lang From: Mark Allman In-Reply-To: Organization: International Computer Science Institute (ICSI) Song-of-the-Day: Nobody Told Me X-URL-0: http://www.icir.org/mallman-files/Document27392.jpg MIME-Version: 1.0 Content-Type: multipart/signed; boundary="--------ma234-1"; micalg=pgp-sha1; protocol="application/pgp-signature" Date: Wed, 09 Jan 2013 00:32:28 -0500 Sender: mallman@icir.org Message-Id: <20130109053228.2D0315B3C59@lawyers.icir.org> Cc: Hal Murray , bloat@lists.bufferbloat.net Subject: Re: [Bloat] bufferbloat paper X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list Reply-To: mallman@icir.org List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jan 2013 05:32:35 -0000 ----------ma234-1 Content-Type: text/plain Content-Disposition: inline > >> but if the connection from the laptop to the AP is 54M and the > >> connection from the AP to the Internet is 1G, you are not going to > >> have a lot of buffering taking place. You will have no buffering on > >> the uplink side, and while you will have some buffering on the > >> downlink side, 54M is your slowest connection and it takes a > >> significantly large amount of data in flight to fill that for seconds. > > > > 54Mbps *might* be your slowest link. It also could be somewhere before > > incoming traffic gets anywhere close to any of the CCZ gear. E.g., if > > the traffic is from my DSL line the bottleneck will be < 1Mbps and on my > > end of the connection. > > Wait a min here, from everything prior to this it was sounding like > you were in a fiber-to-the-home experimental area that had 1G all > the way to the houses, no DSL involved. You noted that in the downlink direction (i.e., traffic originating at some arbitrary place in the network that is *outside* the FTTH network) would be bottlenecked not by the 1Gbps fiber that runs to the house, but rather by the final 54Mbps wireless hop. All I am saying is that you are only half right. We know the bottleneck will not be the 1Gbps fiber. It *might* be the 54Mbps wireless. Or, it *might* be some other link at some other point in the Internet before the traffic reaches the 1Gbps fiber that connects the house. My example is if I originated some traffic at my house (outside the FTTH network) that was destined for some host on the FTTH network. I can pump traffic from my house at < 1Mbps. So, that last hop of 54Mbps cannot be the bottleneck. allman ----------ma234-1 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (Darwin) iEYEARECAAYFAlDtAOwACgkQWyrrWs4yIs6Z9ACglwl3FwTqcunqbSfII6LyRCjl M0gAoJVQHi0Zl3veRrj9ZgMp9+i9qmJI =bMvt -----END PGP SIGNATURE----- ----------ma234-1--