Question
Download Solution PDFConsider a paging system where translation look aside buffer (TLB) a special type of associative memory is used with hit ratio of 80%.
Assume that memory reference takes 80 nanoseconds and reference time to TLB is 20 nanoseconds. What will be the effective memory access time given 80% hit ratio?Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFData:
TLB hit ratio = 0.8
TLB miss ration = 0.2
TLB reference time = 20 ns
Main Memory reference time = 80 ns
Formula:
Effective memory access time (EMAT)
= TLB hit (TLB time + Main memory time) + TLB miss (TLB time + 2 × Main memory time)
Calculation:
EMAT = 0.8 (20 + 80) + 0.2 (20 + 80 + 80)
= 80 + 36
∴ EMAT= 116 ns
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