光纤通道网络实时性能分析

针对航空电子光纤通道网络的实时性问题,建立了光纤通道的网络演算模型,分析了在交换机不同服务策略下系统各类数据流的延迟上界情况,给出了计算在交换机不同服务策略下各类数据流延迟上限的数学方法.分析结果表明与先到先服务(FCFS,First Come First Service)服务策略相比,非抢占式静态优先级(NPP,Non-Preemptive Priority)服务策略可以降低高优先级数据的延迟上界,能更好地满足高优先级数据的强实时性要求.通过与仿真结果比较可知,仿真结果与此数学方法的分析结果一致,此方法适于分析系统中各类消息的延迟上界情况,可用于光纤通道网络设计和性能评价. 

Real-time performance evaluation in fibre channel networks

To solve real-time performance evaluation problem in fibre channel (FC) network, a network model of the FC networks was built, and then two different switch strategies were proposed to satisfy different needs of avionic networks. A method of end-to-end maximum delay calculation was provided, based on network calculus analysis theory. Delay upper bounds based on the strategies of switches were analyzed. The analysis results show that using non-preemptive priority (NPP) service strategy, compared with first come first service (FCFS) service strategy, can reduce the upper bound delay of high-priority data stream. Finally, the evaluated method was testified by the simulation results on OPNET.