Abstract

基于反馈的两级交换结构FTSA(Feedback-based Two—stage Switch Architecture)在仿真中表现出极其优异的时延性能,但该结构对调度算法的时间限制使其理论性能无法实现。针对这一问题,该文基于2+错列对称的crossbar连接模式提出一种改进的反馈制两级交换结构FTSA-2-SS(FTS Ausingthe2-Staggered Symmetry connection pattern),应用该连接模式可使信元传输与调度算法并行工作,从而将算法的时域空间拓展到一个时槽。此外,该文还利用双信元缓冲模式和RB(Re—sequencing Buffer)来解决由此而带来的信元冲突和失序问题。理论分析表明FTSA-2-SS和FTSA具有相同的稳定性,仿真结果显示FTSA-2-SS的时延性能优于其他非反馈负载均衡结构。

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