性能分析1. For one or more selected protocols, make a study of protocol performance, measured in payloads delivered per second, as a function of the checksum error rate, lost packet rate, and timeout interval. For example, provide graphs showing payloads/sec as a function of timeout interval, for various error rates. What can you conclude? Efficienciy = F ( timeout _interval , loss_rate , err_rate ) Throw a sprat to catch a whale.
性能分析Q:Compare the performance of protocols 5 and 6 in detail with respect to payloads/sec and number of retransmissions for a wide variety of parameters. Under which circumstances is protocol 5 better? protocol 6?Q: The function pick_event() has built-in priorities for events. For example, for protocol 5, frame arrivals go before timeouts. Experiment with changing these priorities (by reordering the statements in pick_event(). What conclusions can you draw?Q: Investigate the number of retransmitted frames as a function of the timeout interval for various parameters? Can you determine what the optimum setting should be?Q:Presently, the simulator advances time one tick at a time. If both processes are blocked on distant timeouts, this process goes slowly. Change the simulator to advance time more quickly when both processes are blocked on the clock.Q：In the simulator at present, packet delivery is essentially instanteous. Change it so that delivery times are variable with a user-settable variance. How does the variance affect protocol performance? …… …… ——One solved questions lead to more……
其它问题 Q:Simulation? loss/grb? 990 / 1024 Q:WHY NOT p1?