Cache Analysis, Continued

Memory-stall clock cycles = Instructions ? Misses ? Miss penalty

Program Instruction

Misses = Instruction miss rate + Data miss rate ? Data references

Instructions

Smaller Cache

Larger Cache

Memory stall clock cycles =

IC ? (0.05 + 0.05 ? 0.5) ?

Absolute miss penalty

Clockcycle time

= IC ? 0.075 ? 180/15 = .9IC

Let IC be instructions per program

Memory stall clock cycles =

IC ? (0.04 + 0.04 ? 0.5) ?

Absolute miss penalty

Clockcycle time

= IC ? 0.06 ? 180/18 = .6IC

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