Performance measurements of Motorola's implementation of MAP

Abstract

The authors present performance measurements for data transfer services at the CASE (common application service elements), transport, and datalink layers of Motorola's implementation of the Manufacturing Automation Protocol (MAP) for a range of message sizes. They compare the performance results of using a stop-and-wait vs. a sliding window protocol, and find that the sliding window permits a 40% speedup. The observe that end-to-end latency exceeds transmission delay by a factor of 25 for 1000-byte messages, thereby making all network access, transmission, and propagation delays negligible when compared to protocol processing. They show that the throughput of CASE and transport is basically linear with message size whereas the throughput of datalink is not. They identify the bottlenecks which constrain total system throughput at each layer. >