Consider A Paging System With The Page Table Stored In Memory

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Consider A Paging System With The Page Table Stored In Memory

memory. (a) If a memory reference takes 50 ns how long does a paged memory reference take? (b) If we add TLBs and 75% of all page table references are found in the TLB. What is the effective memory reference time? (Assume that finding a page-table entry in the TLBs takes 2 nanoseconds, if the entry is present).
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(a) 100 ns. 50 ns to access the page table, plus 50 ns to access the word in memory (b) 2 + (0.75 50) + (0.25 100) = 64.5 ns
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