CUBIC is congestion control algorithm designed keeping in mind the
issues with networks having high bandwidth delay product. It is
current congestion control algorithm being used in Linux kernels.
The algorithm modifies the linear increase function of TCP to a
cubic function. It also has a better response time and maintains
the fairness against concurrent TCP flows. It exhibits a TCP
friendly nature over a much vast range of values for Round Trip
Time, Bandwidth and Error Rate. But, it also has a problem of
aggressive increase and slow convergence of flows causing prolonged
unfairness for short lived flows. We have tried to understand these
implications of the CUBIC TCP algorithm and explore reasons and
suggest solutions for them. The solutions suggested are not purely
mathematical but, they lay a foundation for a full fledged
algorithm gives hints towards what improvements should be
implemented to better the performance of CUBIC. For studying and
analysis we have implemented CUBIC in Linux and simulated it in
ns-2.
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