Compound TCP Summary (by Song, Zhang & Murari)

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The Transmission Control Protocol (TCP) carries most Internet traffic, so performance of the Internet depends to a great extent on how well TCP works.
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Compound TCP Summary (by Song, Zhang & Murari) Advanced Computer Networks CS577 – Fall 2013 WPI, Worcester. Presented by Pankaj Didwania and Prof. Kinicki Oct.8th, 2013

CS577: Compound TCP Summary Microsoft Algorithm Introduced during Vista/2008 Server time Addresses issues with standard TCP that fails in fast data transfer over high speed and long distance networks environments. A combination of delay based and loss based approach is proposed in this paper. CS577: Compound TCP Summary

CS577: Compound TCP Summary Key Idea Objective : Satisfy efficiency and TCP friendliness requirements simultaneously Use scalable delay-based component into the standard TCP congestion avoidance algorithm Rapid Window increase when network is under-utilized Gracefully reduce the sending rate once the bottleneck queue is built CS577: Compound TCP Summary

CS577: Compound TCP Summary Architecture Maintains two windows: cwnd and dwnd win = min ( cwnd + dwnd, awnd) cwnd: conventional congestion window, controls the loss-based component. dwnd: new variable, controls the delay-based component. awnd: advertised window from the receiver. CS577: Compound TCP Summary

CS577: Compound TCP Summary Conclusions CTCP generally improves the throughput by 28% to 52% compared to regular TCP CS577: Compound TCP Summary

CS577: Compound TCP Summary Conclusions The bandwidth stolen of CTCP with and without gamma auto-tuning. The markers on x-axis, 1:n, mean that there are one regular flow and n CTCP flows 6 CS577: Compound TCP Summary

CS577: Compound TCP Summary References: Paper by Song, Zhang and Murari. Review document : Eric Wang CS577: Compound TCP Summary