[Make-wifi-fast] the future belongs to pacing

[Luca Muscariello]

It is not surprising that BBR comes from Van who's also designed and
implemented pathchar.

I liked reading the paper when it was published and it has the merit to be
simple to read
for a large audience.

I agree very much on the title as bang-bang congestion control (not only
AIMD) could be
deprecated entirely by measurement based approaches like BBR.

In bang-bang cc the sending rate is obtained by a root-finding algorithm
(gradient based) that
is fed by measurements of congestion (queue, loss, latency), whereas in BBR
the sending rate is
an (almost?) explicit function of the measured quantities.

In theory both approaches work, but for the former we have seen a
proliferation of root-finding algorithms
for wireless, large BDP networks, small BDP network, satellite, cellular,
shared-media, non-shared media and more.
Selection of the right one is a question of tuning, which is extremely
complex and static.

If BBR can fix that by having a unique model for all these cases that would
make deprecation, as intended in the paper,
likely to happen.


On Fri, Dec 13, 2019 at 10:25 PM Dave Taht <dave.taht at gmail.com> wrote:

> and everything we know about the tcp macroscopic model, is obsolete,
> according to a  provocative paper by matt mathis and Jamshid Mahdavi
> in sigcomm.
>
> https://ccronline.sigcomm.org/wp-content/uploads/2019/10/acmdl19-323.pdf
>
>
>
>
> On Fri, Dec 13, 2019 at 1:05 PM Carlo Augusto Grazia
> <carloaugusto.grazia at unimore.it> wrote:
> >
> > Hi Dave,
> > thank you for your email!
> > Toke told me about AQL a couple of weeks ago, I definitely want to test
> it ASAP.
> > BBR struggles a lot on Wi-Fi interfaces (ones with aggregation) with
> kernel 4.14 & 4.19.
> > Anyway, it seems that with BBRv2 on new kernels this problem does not
> exist anymore.
> >
> > Best regards
> > Carlo
> >
> > Il giorno ven 13 dic 2019 alle 20:54 Dave Taht <dave.taht at gmail.com> ha
> scritto:
> >>
> >> https://sci-hub.tw/10.1109/WiMOB.2019.8923418
> >>
> >> It predates the aql work, but the bbr result is puzzling.
> >>
> >>
> >> --
> >> Make Music, Not War
> >>
> >> Dave Täht
> >> CTO, TekLibre, LLC
> >> http://www.teklibre.com
> >> Tel: 1-831-435-0729
> >
> > --
> > --------------------------------------------------------------------
> > Carlo Augusto Grazia, Ph. D.
> > Assistant Professor
> > --------------------------------------------------------------------
> > Dept. of Engineering "Enzo Ferrari"
> > University of Modena and Reggio Emilia
> > Via Pietro Vivarelli, 10/1 - 41125 - Modena - Italy
> > Building 26, floor 2, room 28
> > Tel.: +39-059-2056323
> > email: carloaugusto.grazia at unimore.it
> > Link to my personal home page here
> > --------------------------------------------------------------------
>
>
>
> --
> Make Music, Not War
>
> Dave Täht
> CTO, TekLibre, LLC
> http://www.teklibre.com
> Tel: 1-831-435-0729
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