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Bandwidth sharing and admission control for elastic traffic. (English) Zbl 1030.68774
Summary: We consider the performance of a network like the Internet handling so-called elastic traffic where the rate of flows adjusts to fill available bandwidth. Realized throughput depends both on the way bandwidth is shared and on the random nature of traffic. We assume traffic consists of point to point transfers of individual documents of finite size arriving according to a Poisson process. Notable results are that weighted sharing has limited impact on perceived quality of service and that discrimination in favour of short documents leads to considerably better performance than fair sharing. In a linear network, max-min fairness is preferable to proportional fairness under random traffic while the converse is true under the assumption of a static configuration of persistent flows. Admission control is advocated as a necessary means to maintain goodput in case of traffic overload.

MSC:
68U99 Computing methodologies and applications
68M10 Network design and communication in computer systems
68M20 Performance evaluation, queueing, and scheduling in the context of computer systems
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