I am trying to calculate memory stall cycles per instructions when adding the second level cache.
I have the following given values:
Direct Mapped cache with 128 blocks
16 KB cache
2ns Cache access time
1Ghz Clock Rate
1 CPI
80 clock cycles Miss Penalty
5% Miss rate
1.8 Memory Accesses per instruction
16 bit memory address
L2 Cache
4% Miss Rate
6 clock cycles miss penalty
As I understand it, the way to calculate the Memory stall cycles is by using the following formula:
Memory stall cycles = Memory accesses x Miss rate x Miss penalty
Which can be simplified as:
Memory stall cycles = instructions per program x misses per instructions x miss penalty
What I did was to multiply 1.8 x (.05 +.04) x (80 + 6) = 13.932
Would this be correct or am I missing something?
