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GATE Question on TLBGATE | GATE-CS-2014-(Set-3)Consider a paging hardware with a TLB. Assume that the entire page table and all the pages are in the physical memory. It takes 10 milliseconds to search the TLB and 80 milliseconds to access the physical memory. If the TLB hit ratio is 0.6, the effective memory access time (in milliseconds) is _________. A. 120 Given, TLB hit ratio = 0.6 Therefore, TLB miss ratio = 0.4 Time taken to access TLB (t) = 10 ms Time taken to access main memory (m) = 80 ms Effective Access Time (EAT) = 0.6 ( 10 + 80 ) + 0.4 ( 10 + 80 + 80 ) = 90 X 0.6 + 0.4 X 170 = 122 Hence, the right answer is option B.
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