A system has an L1 cache with a hit rate of 87% (hits take one cycle). The L2 cache has a hit rate of 90% and a penalty of 10 cycles. The main store has an access time of 200 cycles. What is the average access time?
What will be an ideal response?
Average access time = 0.87 × 1 + (1 ? 0.87) × 0.90 × (10 + 1) + (1 ? 0.87) × (1 ? 0.90) × 200
= 0.87 + 1.29 + 2.60 = 4.76
Note that the time for a L2 hit is 1 cycle + 10 cycle penalty.
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