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In a paging system a TLB lookup takes 20 ns, a memory access takes 100 ns and the TLB hit ratio is 80%. Assuming single-level paging, what…

1160Medium DSSSB TGT Computer Science 0 replies

In a paging system a TLB lookup takes 20 ns, a memory access takes 100 ns and the TLB hit ratio is 80%. Assuming single-level paging, what is the effective memory access time?

A120 ns
B140 ns
C160 ns
D220 ns

Correct answer: B

Explanation

Hit: 20 + 100 = 120 ns; miss: 20 + 100 + 100 = 220 ns; EAT = 0.8 × 120 + 0.2 × 220 = 140 ns.

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