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Performance modeling of TCP/AQM with generalized AIMD under intermediate buffer sizes
Eun, D.Y.; Wang, X.;
Performance, Computing, and Communications Conference, 2006. IPCCC 2006. 25th IEEE International
10-12 April 2006
Page(s):8 pp.
Abstract:
For TCP/AQM systems, the issue of buffer sizing has recently received much attention. In the recent literature, it is suggested that the buffer size be O(/spl radic/N) for high link utilization contrasting to the traditional bandwidth-delay product, i.e., O(N) for 100% utilization where the link has capacity NC serving N flows. However, these results are all limited to the drop-tail scheme and there has been no systematic modeling framework for any buffer sizing between O(/spl radic/N) and O(N). In this paper, we study the limiting behavior of a TCP/AQM system for an intermediate buffer sizing of O(N/sup /spl gamma//) (0.5/spl les//spl gamma/<1). We develop a stochastic model in a discrete-time setting to characterize the system dynamics and then show that we can have 100% link utilization and zero packet loss probability for a large number of flows when the buffer size requirement is anywhere between O(/spl radic/N) and O(N). Our model is general enough to cover any queue-based AQM scheme with ECN marking (including the drop-tail) and various generalized AIMD algorithms for each TCP flow.
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