Re: types of traffic in tcp congest control

[J Wu <[e-mail]>]

On Sun, 12 May 2002, ´óÀî wrote:

> Hello,
>
> I need some help with the following :
>
> i had read a paper writen by Steven H.low, Internet Congestion Control ,published by ieee control systems magazine , which describes the types of traffic as follows:
>
> most TCP connections are "mice" (short, but requiring low latency), but a few long TCP connections ("elephants," which can tolerate latency) generate most of the traffic. By controlling the network around a state with full queues, the elephants subject the mice to unnecessary loss and queueing delays...
>
> i don't think that "mice" or "elephants" have direct relationship with the long or short latency, the length of latency may be caused by the type of application, such as voice, multimedia, as so no.
>
> Please check this  viewpoint,  thanks.
>
> Y. Lee
>
> Yong Lee,  Ph.D Candidate
> Network Lab.
> Dept. of Computer Science & Engineering
> Southeast University
> Sipailou2#(PC.210096)
> Nanjing, P.R.China
> (Phone) [phone]
>
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>

Hi Li,
I think that the "length of latancy" in your email is representing for
network delays, which caused by queuing delay at routers and propagation
delay of the medias. So, this kind of lantancy is absolutly decided by the
transmittion subnet and have nothing to do with the upper layer
applications.

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. If cut off the large scale
transmitions for a litte to eliminate the congestion, which can benifit
a lot for the delay sensitive small scale transmitions.Also, as the
"elephant" is huge that harms little for gives way to "mice".


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