From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id A7B563B29E; Wed, 20 Jun 2018 02:56:41 -0400 (EDT) Received: from [172.16.11.169] ([134.76.241.253]) by mail.gmx.com (mrgmx101 [212.227.17.168]) with ESMTPSA (Nemesis) id 0LtEtL-1gBLz830Op-012mED; Wed, 20 Jun 2018 08:56:33 +0200 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.4 \(3445.8.2\)) From: Sebastian Moeller In-Reply-To: <4D964A33-9AEC-4F5F-94C9-5A1FE430F2E2@gmx.de> Date: Wed, 20 Jun 2018 08:56:31 +0200 Cc: bloat Content-Transfer-Encoding: quoted-printable Message-Id: <45C92436-3944-493B-9C17-C678A9027B08@gmx.de> References: <1529339194.276412941@apps.rackspace.com> <1529361825.80979395@apps.rackspace.com> <145517.1529440447@turing-police.cc.vt.edu> <4D964A33-9AEC-4F5F-94C9-5A1FE430F2E2@gmx.de> To: cerowrt-devel@lists.bufferbloat.net, valdis.kletnieks@vt.edu, =?utf-8?Q?Dave_T=C3=A4ht?= X-Mailer: Apple Mail (2.3445.8.2) X-Provags-ID: V03:K1:Azd6+Wpp41uKA7vipFTjW4TC1cdy2al5nFhfdL9rRhheB+xn9+G vxkH2wwCppxPTZkD54eoPA1JAt/3OP9YNPDg7Z5kRtkk5oGAWX87rT7GJKoT1zJ5qi1mxZU +AuNibiwFQovXKIwa3HjvcxXJ+hD5xjNd3AOizGFf8wTN0olj2x6lbnB0GSEYWgebpSFDnl SdE3PumE3gUbyBHnl/dPw== X-UI-Out-Filterresults: notjunk:1;V01:K0:cq39NlLzlrA=:Gu/xfk+GPtJoSOe/FIf9Hx KydBhrXtV9n1adGie9XZIfacCzQuUU/BwpIfms9HtsVIUa5NQIbfPKvuUkBKwJRCNeThGp+9u i0VVwUk7pIi0497DFeTztWj+3EZLrfky+uOUij5EMvunKmZk2/zYxJEH2YGaG5iB4cFSSrWsC /iD1ys/AgK+b57h6tRbsJ7LzkVbBV9PhtwMTyybCXWWmr4K8zabTc4jmqG4eNy0Pk0ppjqAbz 551fBakDUJvvCKOMqeiO6HCK/4Aj1I9yQzaOCugzLPgzOBHbR0ApA6zrBJO0lTtD4pmh/iciJ U7mggCfw3NrO4yKatcm8sIN5COtVlRs3eN/yIf+tApV4GQRB0ruuIJ3rojb4X1UEwn31pMvTf ChbtyC6HcSSKLSbNOVtUc2/XLmXga9q/okcw90vdh+1wJpe0X/qfvnrfcgb5qy24la6bI7uhA 1DMr3H/gHrOjaIQ9F+7v8Lxpl1JPjcpPv7NOQ3KY9qyOYaiPJnL110A4o1MwYN4jp/2ENTBqm wt8cUGg80Ig95+LCvWEHP0WqykMZrXR+ML2yIlJY48/ZYzofLFLluJO9UnWA2AOzDL+5xvKQj qqKhljcvMAb4luDdLhCZelSoIu444V+2DGXEQF3m8MaejcRgYBHkmc48W8nF+szRM6ERgugY2 scPMqQj4aXTCUXogdlCs7XZ7F3BPJ5W1zAGWMiRrLSmTldj9HBXMH+MVwy0zlJapmtc0Nw8hp a0ta0O3DHeYr+X+YGAxpiWLY3tM3IFcXfVbdTUbOq+n5mgAnjdzlgt9zFR1qMcpaiIFFSTjZa LCKKvdt Subject: [Cerowrt-devel] =?utf-8?q?=28no_subject=29?= X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 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, 20 Jun 2018 06:56:42 -0000 Hi all, > On Jun 20, 2018, at 01:32, Sebastian Moeller wrote: >=20 > Well, >=20 > On June 19, 2018 10:34:07 PM GMT+02:00, valdis.kletnieks@vt.edu wrote: >> On Mon, 18 Jun 2018 18:46:18 -0700, Dave Taht said: >>=20 >>> One of cake's "minor" features is the *perfect* defeat of the htb >>> based shaper in cable modems. If you know the set-rate on the modem, >>> you just set it to the same thing and get vastly superior = performance >> to >>> docsis 3.1, pie, or the sqm-scripts. >>=20 >> Do we have a good cookbook on how to determine the set-rate? >=20 > With cable =20 > Measured TCP/ipv4 goodput * ((1518)/(1500-20-20)) =3D lower bound = gross bandwidth estimate Addendum: when running speedtests on cable for the purpose of estimating = the "true" docsis shaper goodput one needs to take care to not be fooled = by transient bandwidth allowances like powerboost but rather one needs = to find the sustainable stable maximum bandwidth; so fun all around. = (And one needs to account for the correct overhead in the equation above = so in the IPv6 case the (1500-20-20) needs to be replaced by = (1500-40-20)) Best Regards Sebastian >=20 > DOCSIS employs a shaper to limit user's exceeding the contracted = rates, that per DOCSIS standard assumes 1518 bytes of accountable raw = frame size. Tangent that 1518 obviously is a 'lie' in that it does not = include all per packet overhead in use on a DOCSIS carrier, but from an = end-user perspective that difference is immaterial... >=20 > I realize that you probably wanted something simpler and more = accurate, sorry to disappoint. >=20 > Best Regards > Sebastian >=20 >=20 >=20 >> _______________________________________________ >> Cerowrt-devel mailing list >> Cerowrt-devel@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/cerowrt-devel >=20 > --=20 > Sent from my Android device with K-9 Mail. Please excuse my brevity. > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel