RE: types of traffic in tcp congest control

[J Wu <[e-mail]>]

On Mon, 13 May 2002, Douglas Otis wrote:

> J Wu,
>
> A given number of Mice may consume the network and reduce effective use of
> Elephants even with  Dense Wavelength Division Multiplexing in the mix.

Indeed, give way to mice will decrease the efficiency of the network, but
gained a low queuing delay, that is a trade-off. As more real-time
applications are deployed to the Internet, it should be worthy.

>
> With TCP framing where small objects are aligned with the segment at high
> rates, would this be  Mice or Rats? : )
>
>  -Doug

Still Mice,

I think the elephant should be:
 (transmission data size) >> (Rtt*(transmission rate))
It should be still acceptable for some non-mice non-elephant connections.
Say "Taker" or "Panda" :))
Jin.


>
> On May 13, 2002 8:48 AM J Wu ([e-mail]) wrote:
> >
> > On Sun, 12 May 2002, Joe Touch wrote:
> >
> > > J Wu wrote:
> > > > Hi Li,
> > > ...
> > > >
> > > > As my understanding of S.Low's paper that the mice stands for
> > > > small scale transmition with delay sensitive and the elephant
> > > > stands for large scale transmition. The small scale
> > > > transmitions will not cause any congestion, but the large
> > > > scale transmitions will.
> > >
> > > That is an assumption, one which other results, notably of bandwidth
> > > limited highly-shared core links (e.g., the US-UK link) refute. They
> > > indicate that mice can indeed cause congestion amongst themselves, even
> > > in the absence of elephants.
> > >
> > > Joe
> >
> > Hi Joe,
> > Well, if only the mice can still congest the link, which shows that the
> > network resources are under severe shortage. The only way to solve under
> > this situation is hardware solution. But I think even under this situation
> > restrict the elephants will also do benefit to alleviate the stage of
> > congestion.
> >
> > And also, it seems that most network congestions are take place at access
> > network which is not the core network.
> >
> >
> > Another question maybe far from this topic: As the invent of new core
> > transmission techniques like DWDM, is congestion control still needed in
> > core network?
> >
> > --
> > Jin Wu
> > School of Computing,
> > University of Leeds.
> > Tel: [phone]
> >
> >
>
>

-- 
Jin Wu
School of Computing,
University of Leeds.
Tel: [phone]