Consider a system with memory access time 50nsec and demand paging with the page table held in MMU registers. It takes 4msec to service a page fault if an empty page is available, and 8msec if replaced page is modified.

a. How long it takes to service a page fault if the replaced page is not modified?

b. Assuming that the page to be replaced is modified 5% of time, an empty page is available 80% of time and the page to be replaced is not modified 15%, what is the maximum acceptable page fault rate for an effective access time of no more than 60nsec.

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