Networking Investigate

The Effect of Round Trip Time on Competing TCP Flows

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Executive Summary

In this paper, the authors describe experiments to investigate the interactions of competing TCP flows typical of a home network. Using a standard FreeBSD 8.2-RELEASE installation, they explore the relationship between queue sizes, congestion windows, latency, and bandwidth and how they relate to each other in such an environment. They find that flows with a higher RTT are at a disadvantage, especially over long running competition. Home Internet connections are often shared concurrently between multiple users with little or no Quality of Service (QoS) utilised.

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