Subject: [ledbat] News from the Internet congestion control world

From: Stanislav Shalunov <[email-masked]>
Date: Fri, 7 Aug 2009 11:42:40 -0700

Dario, Claudio, Paolo,

Thank you for this contribution.

I'm sure others will want to play with the model when it's available
as well, so this will be valuable.

It might be interesting to also run the simulation with a slightly
modified measurement code.  Perhaps adding a small random component to
the measured off_target quantity to simulate real-world noise.  Maybe
something like an exponentially distributed deviate with a mean of a
few milliseconds -- might make sense to try different things and see
if it makes any difference.  This should not affect the LEDBAT-TCP
scenario, but might affect LEDBAT-LEDBAT scenarios.

Thanks,  -- Stas

On Fri, Aug 7, 2009 at 10:19 AM, dario rossi<[email-masked]> wrote:
> Dear all,
>
>
> this message to inform you that we've been implementing a Ledbat module for
> ns2, that we would like to share with the community as open source code.
>
> as the code requires a little bit of cleanup, we expect to put it on a
> webpage after the summer (we'll announce on the mailing list as soon as it
> will be ready)
>
> at the same time, we also would like to share some preliminary results which
> are well in line with discussions going on in the list, and that are
> accessible at: http://arxiv.org/abs/0908.0812
>
> shortly, we find that late comer situations do arise; however, we also find
> that a simple mean to break unfair situations could be to use slow-start (as
> this will let the flows loose some packets, allowing the capacity to drain
> the queue, which in turn allows late comers to gather a good measurement of
> the base delay; more details in the paper)
>
> we have more activities going on, we expect to report on that after the
> summer period as well.
>
> Best regards,
> D.
>
>
> --
>
> Oo   Dario Rossi
>   >    Ass. Prof.
> ~     Telecom ParisTech
> http://www.enst.fr/~drossi
>
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>
>

-- 
Stanislav Shalunov
BitTorrent Inc
[email-masked]

personal: http://shlang.com