An analytical model for predicting the performance of protocol software implementation in a layered communication architecture is proposed. Each layer is modeled by a queuing network. The model is constructed by focusing the behavior of the protocol entity in a layer. A first come, first served (FCFS) server queue with preemptive priority is employed for an entity and an infinite-server queue for response time of acknowledge packets. Respective layer models are piled up by embedding the lower services in the infinite-server queue. From the perspective of end-to-end performance, the model provides a solution for the following problems, which arise in implementing a layered communication protocol: assigning each layer's process to a processor; giving priority to respective processes in each processor; and providing an error recovery service. The authors present an approximate analysis to obtain an average end-to-end transmission delay and discuss the possible solutions for the problems mentioned.
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