Tools for the Evaluation of Simulation and Testbed Scenarios
user-5e9d449e4c775e765d44d7c9(2008)
摘要
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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关键词
Testbed,Network congestion,Scenario testing,Network packet,Synchronization,Real-time computing,Underpinning,Engineering,Internet congestion control
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