Abstract:
We advocate the use of admission control to limit the number of TCP flows on a network link to ensure that each has a minimal acceptable throughput. We demonstrate that, in the absence of such a control, the ineffective traffic due to the retransmission of lost packets constitutes a significant overhead and can even lead to congestion collapse in certain configurations. A second cause of inefficiency is the incomplete transmission of documents whose transfer is abandoned by users or higher protocol layers experiencing very low throughput. Admission control removes the cause of flow interruption, maintaining goodput even in case of demand overload. Finally, we discuss implementation issues, recognizing that the proposed admission control procedure is at the limit of current technology. 1
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