还想请问大家这题的解析，因为根据题目所提供的情况， Consider the system running ten tasks and one CPU bound task.Assume that the I/O bound tasks issue an I/O operation once for every millisecond of CPU computing and that each I/O operation takes 10 millisecond to complete. Also assume that the context switching overhead is 0.1 millisecond and that all processes are long-running tasks. What is the CPU utilization for RR scheduler when: (1)time quantum=1 millisecond (2)time quantum= 10 millisecond 可以了解CPU burst(T)=1, I/O=10,context switch=0.1 (1)第一题没有问题，因为T=Q,所以CPU utilization=T/S+T=1/1+0.1=1/1.1 (2)第二题我就不太了解为何会有20,毕竟Q=10,Q>T,所以应该是T/S+T=1/1+0.1, 为何会是答案所给的20/21.1呢？