RE: Info on MAE-EAST

From: dave o'leary []
Sent: Friday, January 17, 1997 3:18 PM
To: Howard C. Berkowitz
Cc: Dorian R. Kim; Brett L. Hawn; Michael Dillon;
Subject: Re: Info on MAE-EAST

Web cacheing would seem to encourage traffic to stay local.



Web Cacheing would seem to be good, except that with most commercial
interactive web sites, you have to deal with state. And until you can
guarantee that the entire state will always be carried by the client (no Ziff
Davis cookie deleter), cacheing is only a partial panacea.

Rodney Joffe
Chief Technology Officer
Genuity Inc., a Bechtel company

Looks to me like data comes in three main flavors:

1) One information source, many information sinks. Information is
different for each person (state information). Typically small.

2) One information soure, many information sinks. Information is the same
for each person, i.e. pictures on website etc. Typically fairly large.

3) Many information sources, many information sinks. Information is
different for each person, i.e. phone calls.

Conference calls, interactive video games and so on fall under category 3
even though one computer coordinates the many to many flow of

Optimizing networks should take the nature of the data into account.
Caching works for type 2, it doesn't for 1+3.

One could further segment data by real-time requirements. This is more of
a lower bound on things since it doesn't change the underlying nature of
the data. In other words the timeframe in which data has to get from the
information source to the information sink before the communication is
negatively impacted. Examples would be minutes for email, seconds for
credit-card authorization, but only tens of millieseconds for voice
communication or video games.