GATE | Gate IT 2008 | Question 15

A paging scheme uses a Translation Look-aside Buffer (TLB). A TLB-access takes 10 ns and a main memory access takes 50 ns. What is the effective access time(in ns) if the TLB hit ratio is 90% and there is no page-fault?
(A) 54
(B) 60
(C) 65
(D) 75


Answer: (C)

Explanation: Effective access time = hit ratio * time during hit + miss ratio * time during miss

TLB time = 10ns,
Memory time = 50ns
Hit Ratio= 90%

E.A.T. = (0.90)*(60)+0.10*110
=65

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