Discussion
In a paged memory management algorithm, the hit ratio is 70%. If it takes 30 nanoseconds to search Translation Look-aside Buffer (TLB) and 100 nanoseconds (ns) to access memory, the effective memory access time is
Answer: D
The effective access time is 160 ns. On a TLB hit (70%) the time is the TLB search plus one memory access, and on a miss (30%) it is the TLB search plus a page table access and then the memory access.
\[ 0.7 (30 + 100) = 91 \]\[ 0.3 (30 + 100 + 100) = 69 \]\[ 91 + 69 = 160 \text{ ns} \]The value 91 counts only the hit part, 69 only the miss part, and 200 is the time for a miss without the TLB search.
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