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To: cerowrt-devel@lists.bufferbloat.net, valdis.kletnieks@vt.edu,
 Dave Taht <dave.taht@gmail.com>
CC: bloat <bloat@lists.bufferbloat.net>
From: Sebastian Moeller <moeller0@gmx.de>
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Subject: Re: [Bloat] [Cerowrt-devel] Invisibility of bufferbloat and its
	remedies
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X-List-Received-Date: Tue, 19 Jun 2018 23:32:51 -0000

Well,

On June 19, 2018 10:34:07 PM GMT+02:00, valdis=2Ekletnieks@vt=2Eedu wrote:
>On Mon, 18 Jun 2018 18:46:18 -0700, Dave Taht said:
>
>> One of cake's "minor" features is the *perfect* defeat of the htb
>> based shaper in cable modems=2E 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=2E1, pie, or the sqm-scripts=2E
>
>Do we have a good cookbook on how to determine the set-rate?

With cable <DOCSIS 3=2E1 one can Snoop the management frames that will als=
o carry the bandwidth definitions=2E Or with a compromised cable modem one =
could dump the DOCSIS config file that also contains that information=2E Or=
 ask the ISP=2E Short of any of that one could run a umber of speedtests ov=
er a 24 hour period and simply extrapolate from the measured goodput to the=
 required 'gross' DOCSIS shaper rate:

Measured TCP/ipv4 goodput * ((1518)/(1500-20-20)) =3D lower bound gross ba=
ndwidth estimate

DOCSIS employs a shaper to limit user's exceeding the contracted rates, th=
at per DOCSIS standard assumes 1518 bytes of accountable raw frame size=2E =
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 perspectiv=
e that difference is immaterial=2E=2E=2E

I realize that you probably wanted something simpler and more accurate, so=
rry to disappoint=2E

Best Regards
        Sebastian



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Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E