Abstract
A response function is usually used to describe the scalability of a protocol for high-speed network. This requires detailed knowledge of the time-domain sending rate. However, studies about the performance of eXplicit Control Protocol (XCP) mainly focus on the steady-state behavior and few address this problem. Under a model with single bottleneck, the time-domain sending rate of XCP is derived in this paper. Simulation results show that this analytic time-domain sending rate is accurate. Combined with a periodic loss model, the response function of XCP is further derived. Unlike response functions of other protocols, the response function of XCP is related to not only the loss event rate, but also the per-flow bandwidth. Simulation results show that it forms an upper bound for the throughput of XCP with given loss event rate and per-flow bandwidth.
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