[altq 1153] Re: ECN implementation

[Nguyen-Tuong Long Le <le@cs.unc.edu>]

Hi,

A couple of months sound a little bit long to me. Could you
explain briefly what are the issues with the current (or old?)
ECN implementation in ATLQ?

I wouldn't mind doing the implementation myself but would like
to avoid duplicate effort if possible. And I'm only interested
in having ECN in FreeBSD 4.3.

I've implemented the PI controller [1] and Gentle RED [2] in the
framework of ALTQ. Although these AQM schemes don't require
end systems to be ECN capable, I thought it would be interesting
to see how AQMs perform when end systems are ECN capable.

[1] C.V. Hollot, V. Misra, D. Towsley and W. Gong. On Designing Improved
Controllers for AQM Routers Supporting TCP Flows. Infocom 2001.
[2] http://www.aciri.org/floyd/red/gentle.html.

Thanks,
Long

On Thu, 25 Oct 2001, Kenjiro Cho wrote:

>
> Nguyen-Tuong Long Le wrote:
> > > 	Kenjiro is working on it. ECN should be part of ALTQ 3.1. See [altq 1076].
> > This sounds great. Thanks for the reply! Is there prediction
> > when ALTQ 3.1 will be available?
>
> In a couple of months, I guess.  But I'm not sure if I can support ECN
> in TCP for all the BSDs...
>
> -Kenjiro
>