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Title : Tools for the Evaluation of Simulation and Testbed Scenarios
Author(s) : S. Floyd, E. Kohler
Filename : draft-irtf-tmrg-tools-03.txt,.ps
Pages : 32
Date : 2006-12-15
This document describes tools for the evaluation of simulation and
testbed scenarios used in research on Internet congestion control
mechanisms. We believe that research in congestion control
mechanisms has been seriously hampered by the lack of good models
underpinning analysis, simulation, and testbed experiments, and that
tools for the evaluation of simulation and testbed scenarios can
help in the construction of better scenarios, based on better
underlying models. One use of the tools described in this document
is in comparing key characteristics of test scenarios with known
characteristics from the diverse and ever-changing real world.
Tools characterizing the aggregate traffic on a link include the
distribution of per-packet round-trip times, the distribution of
connection sizes, and the like. Tools characterizing end-to-end
paths include drop rates as a function of packet size and of burst
size, the synchronization ratio between two end-to-end TCP flows,
and the like. For each characteristic, we describe what aspects of
the scenario determine this characteristic, how the characteristic
can affect the results of simulations and experiments for the
evaluation of congestion control mechanisms, and what is known about
this characteristic in the real world. We also explain why the use
of such tools can add considerable power to our understanding and
evaluation of simulation and testbed scenarios.
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