I-D ACTION:draft-irtf-tmrg-tools-03.txt

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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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