interface message processorIMPthroughput/O time for packets and message acknowledgments, and the overhead for various periodic IMP processes such as its routing computations.；每秒钟通过接口机的主机数据位数。下列参数与之有关:每个报文信息包的个数,每个包的程序处理时间,对所有包以及报文信息确认的输入输出时间,接口机的各种定期处理所需的开销,例如路由计算。