Consider a paging system with the page table stored in memory.
a. If a memory reference takes 200 nanoseconds, how long does a paged memory reference take?
b. If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effecttive memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time, if the entry is there.)
a. If a memory reference takes 200 nanoseconds, how long does a paged memory reference take?
b. If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effecttive memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time, if the entry is there.)
b. Effective access time = 0.75 x (200 nanoseconds) + 0.25 x (400 nanoseconds) = 250 nanoseconds.