Consider a paging system with the page table in memory. A. If a memory reference

Question

Consider a paging system with the page table in memory.

A. If a memory reference takes 100 nanoseconds, how long does a paged memory reference take?

B. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry for the TLBs takes 20 nanoseconds.)

C. It takes 750 milliseconds to service a page fault. The page fault rate is .001. What is the EAT? Include the TLB hit and miss portions of the equation.

(4th Question Posting is the charm, first 3 postings had 3 different answers. Lets try this one more time)

Explanation / Answer

A)100 ns for page table and another 100 nsfor word in memory.
Total = 200 ns.
B) 75% * hit-time + 25% * TLB miss-time
= 75%* 100 ns + 25% * 200 ns
= 75+50
= 125 ns

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