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Reports (Research Report) Year : 2008

Modelling an Isolated Compound TCP Connection

Abstract

Compound TCP (CTCP) was designed by Tan at al. to improve the efficiency of TCP on high speed networks without unfairly penalizing other connections. In the present work we construct and analyze a detailed model of an isolated CTCP connection. We validate it with ns-2 simulations using a Linux implementation of CTCP. The detailed model allows us to identify and classify significantly different CTCP operating regimes depending on the system parameters. We show that in the “constant window” phase the congestion window can in fact have significant oscillations with non-negligible effect on the performances and which can, also, induce additional jitter in the cross traffic. Using this model we calculate the average throughput and average backlog size at the bottleneck link. These performance metrics depend on the CTCP operating regime. Under certain circumstances, an isolated CTCP connection on a high speed link utilizes around 75\% of the link capacity.
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Dates and versions

inria-00349845 , version 1 (08-01-2009)

Identifiers

  • HAL Id : inria-00349845 , version 1

Cite

Alberto Blanc, Konstantin Avrachenkov, Denis Collange. Modelling an Isolated Compound TCP Connection. [Research Report] RR-6778, INRIA. 2008. ⟨inria-00349845⟩
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