From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.15.19]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mout.gmx.net", Issuer "TeleSec ServerPass DE-1" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 41CC221F2BD for ; Wed, 18 Mar 2015 01:07:08 -0700 (PDT) Received: from [192.168.150.7] ([134.76.241.253]) by mail.gmx.com (mrgmx002) with ESMTPSA (Nemesis) id 0MD9NE-1YkCjU1E4K-00GZKZ; Wed, 18 Mar 2015 09:06:16 +0100 User-Agent: K-9 Mail for Android In-Reply-To: References: <20150316203532.05BD21E2@taggart.lackof.org> <123130.1426635142@turing-police.cc.vt.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable From: Sebastian Moeller Date: Wed, 18 Mar 2015 09:06:12 +0100 To: "David P. Reed" , Valdis.Kletnieks@vt.edu, Matt Taggart Message-ID: X-Provags-ID: V03:K0:LFJdt8jJ6DDbWGXko+66oLdjrmYkQNBlCSSQlrHDT+dUJ6TQFCB 9MjGmjlAal2fG+/D/gsjKP+Sj9ZJrkhaUHBEa+i/8RVjzx41kocqPOTLSwcdoXGvp0Q+MQL +VDD6c79x9R35RseA4rjjhs9V3LtAA04/tjY4zZpqJnHGPv9pD5jaF91zHqFVYB/IfdwILH FdqP7hFW8SckUFmzv8BJg== X-UI-Out-Filterresults: notjunk:1; Cc: cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] DOCSIS 3+ recommendation? X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Mar 2015 08:07:38 -0000 Hi David, On March 18, 2015 5:34:30 AM GMT+01:00, "David P=2E Reed" wrote: >It is not the cable modem itself that is bufferbloated=2E It is the head >end working with the cable modem=2E Docsis 3 has mechanisms to avoid >queue buildup but they are turned on by the head end=2E I seem to recall that even on egress charter cable showed multiple= s hundred of bufferbloat, so I would argue that even at docs is 3=2E0 the m= odems might be over buffered or under-AQM'd=2E The head end certainly is an= other problem=2E=2E=2E > >I don't know for sure but I believe that the modem itself cannot >measure or control the queueing in the system to minimize latency=2E I believe this is supposed to happen with docs is 3=2E1 where PIE = is mandatory in the modems=2E Now whether the ISPs will activate it or not = I do not know=2E Best Regards sebastian > >You can use codel or whatever if you bound you traffic upward and >stifle traffic downward=2E But that doesn't deal with the queueing in the >link away from your home=2E > >On Mar 17, 2015, Valdis=2EKletnieks@vt=2Eedu wrote: >>On Mon, 16 Mar 2015 13:35:32 -0700, Matt Taggart said: >>> Hi cerowrt-devel, >>> >>> My cable internet provider (Comcast) has been pestering me (monthly >>email >>> and robocalls) to upgrade my cable modem to something newer=2E But I >>_like_ >>> my current one (no wifi, battery backup) and it's been very stable >>and can >>> handle the data rates I am paying for=2E But they are starting to roll >>out >>> faster service plans and I guess it would be good to have that >option >>(and >>> eventually they will probably boost the speed of the plan I'm paying >>for)=2E >>> So=2E=2E=2E >>> >>> Any recommendations for cable modems that are known to be solid and >>less >>> bufferbloated? >> >>I've been using the Motorola Surfboard SB6141 on Comcast with good >>results=2E >>Anybody got a good suggestion on how to test a cablemodem for >>bufferbloat, >>or what you can do about it anyhow (given that firmware is usually >>pushed >>from the ISP side)? >> >> >>------------------------------------------------------------------------ >> >>_______________________________________________ >>Cerowrt-devel mailing list >>Cerowrt-devel@lists=2Ebufferbloat=2Enet >>https://lists=2Ebufferbloat=2Enet/listinfo/cerowrt-devel > >-- Sent with K-@ Mail - the evolution of emailing=2E > >------------------------------------------------------------------------ > >_______________________________________________ >Cerowrt-devel mailing list >Cerowrt-devel@lists=2Ebufferbloat=2Enet >https://lists=2Ebufferbloat=2Enet/listinfo/cerowrt-devel --=20 Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E