We made some analysis about Powerboost in our SIGCOMM paper
and it looks like a couple of TBFs with different bucket sizes (then not
just one shaping rate).
From our results ~5MB is the bucket size for upstream and ~10MB for
downstream.

It shouldn't be too difficult to setup a such htb.
Probably, to better model its real behavior. the analysis should be extended
to a wider set of users.

The related patent (US 7,289,447 B2) clearly says that its behavior can be
dynamically changed depending on the network conditions.

-Walter

2011/7/7 Dave Taht <dave.taht@gmail.com>

> It would be good to be able to have a working htb model of powerboost.
>
> ---------- Forwarded message ----------
> From: elided
> Date: Thu, Jul 7, 2011 at 1:10 PM
> Subject: Comcast Powerboost parameters
> To: Dave Taht <dave.taht@gmail.com>, Jim Gettys <jg@freedesktop.org>
>
>
> Well, I poked around a bit and found the information was a little
> harder to find than I remembered.
> Here are three data points, none of them seem to be completely definitive:
>
> http://customer.comcast.com/Pages/FAQListViewer.aspx?topic=Internet&folder=8b2fc392-4cde-4750-ba34-051cd5feacf0
> …hopefully that URL will work for you.  Click on How long does the
> PowerBoost burst last.  It indicates 5MB upstream token bucket burst.
> http://www.dslreports.com/faq/14520
> …Indicates 10MB upstream token bucket burst
> http://www.cc.gatech.edu/~partha/shaperprobe-TR.pdf
> …table 2 indicates 5 or 10 MB depending on service tier.
>
> Seems as though it is likely either 5MB or 10MB.  A fairly simple test
> could validate which one your connection has.
> -Greg
>
>
>
> --
> Dave Täht
> SKYPE: davetaht
> US Tel: 1-239-829-5608
> http://the-edge.blogspot.com
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>


-- 
Walter de Donato, PhD Student
Dipartimento di Informatica e Sistemistica
Università  degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +39 081 76 83821 - Fax: +39 081 76 83816
Email: walter.dedonato@unina.it
WWW: http://wpage.unina.it/walter.dedonato