R: R: [e2e] [Fwd: RED-->ECN]

[Saverio Mascolo]

I think that RED is a simple and effective idea. As it is usual with V.
Jacobson proposals, it is an intelligent solution that takes into account
engineering constraints. Thus I agree that RED is an easy task that should
be performed by the network.
Moreover I think that TCP Reno fast recovery should be a little bit modified
to take into account RED and I think that dropping should be related to
instantaneous queues. We are currently preparing a report on this.
Thanks
Saverio



> Averaging would tend to filter out transient congestion (due to data
bursts)
> but will take into account perstistent congestion.  During transient
> congestion data will be discarded not by RED but by tail drop.
>
> Thanks
> Mohammed Atiquzzaman           Tel:   (405) 325 8077
> School of Computer Science     Fax:   (520) 962 8422,
> University of Oklahoma                (405) 325 4044
> 200 Felgar St., Room EL-154    Email: atiq at ou.edu
> Norman, OK 73019-6151                 atiq at ieee.org
> www.cs.ou.edu/~atiq
>
> >
> > Saverio Mascolo, Ph.D
> >
> > Associate Professor
> > Dipartimento di Elettrotecnica ed Elettronica
> > Politecnico di Bari
> > Via Orabona 4
> > 70125 Italy
> > email: mascolo at poliba.it
> > tel. +39 080 5963621
> > fax. +39 080 5963410
> > http://www-dee.poliba.it/dee-web/Personale/mascolo.html
> >
> > > Saverio Mascolo wrote:
> > > >
> > > > What Hollot says is right. Averaging the queue makes much
> > more difficult
> > to
> > > > control the queue level. In control terms is like to add
> > another pole in
> > the
> > > > feedback loop.
> > > > An interesting paper is also "Reasons not to deploy RED"
> > by J. Bolot et.
> > al.
> > > > ( at http://citeseer.nj.nec.com/337634.html).
> > > > This paper experiments average vs. instantaneous queue
> > RED dropping.
> > > >
> > > ...
> > >
> > > There are a lot of interesting things to look at in
> > RED-type work and
> > > one of them is to closely examine the quality of the experiments
> > > that are done and cited in papers. Unless the above cited paper has
> > > changed since someone at Cisco asked me to look at it, all I can
> > > say is if your network looks like that of their experiments (set up,
> > > RTTs, traffic mix), then perhaps the results apply. There is a body
> > > of measurement work that shows that most networks look
> > rather different
> > > from this. I'm personally interested in results that show some
> > > robustness,
> > > but this may not be currently fashionable.
> > >
> > > Kathie Nichols
> > >
> >
>