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[ns] Http traffic generation using Bruce Mah's model



Hi,

I have found a couple implementations of Bruce Mah's model in NS. One is in
the standard distribution (/ns/tcl/http) and the other one is a contributed
implementation (http://http.cs.berkeley.edu/~tomh/wwwtraffic.html). Both are
using the same set of CDFs, and I have found that they have slightly modified
the original model. Although qualitatively similar, the distributions do not
correspond with the ones provided by Bruce Mah
(http://www.ca.sandia.gov/~bmah/Software/HttpModel/). Additionally, primary
and secondary reply length distributions have been unified. Does someone know
the reason for these changes? Just a simplification?

By the way, the contributed implementation generates all the server replies at
the same time. That's a fundamental change to the original model, where
request/reply pairs are generated sequentially.

Thanks.

-- Felix Hernandez.