PROBLEM 3 Suppose you have to decide if you would like to use a one Level cache or a 2 Level cache processor in a system with a memory which exhibits 50 ns access. The cache exhibits the following performance characteristics: Level 1 cache: Split configuration with: - I miss rate 3% - D miss rate 5% - Frequency of data accesses 20% - Hit time at Level 1 is 1ns Level 2 cache: Unified configuration with: - Miss rate 10% - Hit time at Level 2 is 3ns Compare the AMAT for the system with only L1, and the system with L1 and L2. Hint: The AMAT for level i (when cache is split instructions from data cache) is: AMATLi=HitTimeTiLi+(InstructionsMissRateLi+DataMissRateMi) Miss Penalty Where Miss Penalty is the AMAT at the next level of cache. The AMAT for level i (when cache is unified) is: AMAT Li= Hit Time Li+ Miss Rate Li Miss Penalty Li