A study of performance evaluation of multi-layred protocols on a transmission line simulated b transputers

为了实现高速的端到端通信，需要使用高效的网络协议。然而，协议与吞吐量之间的关系趋于复杂，特别是在多层协议下运行的复杂网络中。特别是在误码率不可忽略的情况下，或者在多层协议下运行的复杂网络中，用软件进行计算机模拟的效果不是很好。作者设计了一个基于硬件的网络协议模拟器，利用转发器来模拟网络节点和网络链路。该模拟器实际执行在网络节点上完成的协议处理，模拟网络链路中的传播延迟和传输误差。利用模拟器，评估了协议参数和网络条件对网络吞吐量和数据包延迟的各种影响。在这里，协议参数包括窗口大小和数据单位长度，网络条件包括传输速率、错误率和传播延迟。本文从校验和计算、并行处理和内存带宽三个方面对高速协议进行了仿真。

To achieve high speed end to end communication, it is needed to use efficient network protocols. However, the relationship between a protocol and throughput tend to be complex especially in complex networks operated under multi-layred protocol. A computer simulation by software is not very effective especially in cases bit error rate is not negligible, or in complex networks operated under multi-layred protocols.The authors devised a hardware-based network protocol simulator using transputers to simulate network nodes as well as network links. The simulator actually performs protocol processing done in network nodes and simulates the propagation delay and transfer error in network links.Using the simulator, the various effects of protocol parameters and network conditions on network throughput and packet delay are evaluated. Here, the protocol parameters include the window size and the data unit length, and the network conditions include the transimission rate, the error rate, and the propagation delay.In this reseach, the proposed simulator has been used to evaluate some-high speed protocols from the viewpoints of checksum calculation, parallel processing, and memory bandwidth.