Problem on memory management

Question

Consider a paging system with the page table stored in the memory. A memory reference takes 100 ns. We add TLBs and 80% of all page table references are found in TLBs. Finding a page table entry in the TLBs take negligible time.
​How long does a paged memory reference take?
(A) 100 ns
(B) 150 ns
(C) 200 ns
(D) 300 ns

I didn't get what does it meant by "paged" memory reference.

Answer 1

Means the memory is divided into pages.. so the logical address generated would search for that particular page in the TLB .If it does not get it will search for that page in the main memory ,get the frame no and the offset to get the physical address in the main memory.. If the page is not in the main memory it will generate a page fault..

Comments

so what is the final answer you guess?

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i m getting 120.. since searching in TLB takes negligible time so 0.80 * memory ref + 0.20 * (2*memory ref time )..=120 i m getting

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I m also getting 120