White Papers

A Study of TCP Fairness in High-Speed Networks

Overview Under the TCP congestion control regime, heterogeneous flows, i.e., flows with different Round-Trip Times (RTTs), that share the same bottleneck link will not attain equal portions of the available bandwidth. In fact, according to the TCP friendly formula, the throughput ratio of two flows is inversely proportional to the ratio of their RTTs. It has also been shown that TCP's unfairness to flows with longer RTTs is accentuated under loss synchronization. Well-known mechanisms to avoid synchronization are based on injecting randomness into the network, e.g., introducing background traffic, using random drop (as opposed to drop-tail queuing). This paper shows that, in high-speed networks, injecting bursty background traffic may actually lead to synchronization and result in unfairness to foreground TCP flows with longer RTTs.

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Publisher: University of Southern California
File Format: PDF
Date Published: Oct 31, 2007
Format: White Papers
Topics: TCP - IP

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