对于共享存储器交换结构,传统的排队模型的分析基于时隙,只能给出总的丢包性能,不能准确给出在不平衡业务分布下,不同的输入端口所具有的不同丢包性能。文中提出共享存储器交换结构在任意输出分布下的一种排队模型,对于完全共享(CS)以及具有最大队长限制的共享(SMXQ)两种存储器共享策略进行了性能分析。该模型基于子时隙建立多个状态空间和相邻子时隙之间的概率转移矩阵。通过仿真验证了所提出的排队模型的准确性。 For the shared memory switching fabric, the traditional queuing model is based on the time slot and can only give the total packet loss performance. It can not accurately give the different packet loss performance of different input ports under unbalanced service distribution. In this paper, a queuing model of shared memory switch fabric under arbitrary output distribution is proposed. Performance analysis is performed on two types of shared memory (SMXQ) sharing policies, ie, full share (CS) and maximum share captain (SMXQ). The model establishes probability transition matrix between multiple state spaces and adjacent sub-timeslots based on sub-timeslots. The accuracy of the proposed queuing model is verified by simulation.