2) Suppose we have a processor with a base CPI of 1.0 cycle per instruction and a cycle time of 4 GHz (pretty hot CPU!). The main memory of the machine has a 100ns access time. With its existing primary cache, it has a 2% miss rate per instruction What is the effective CPI taking into account the primary cache miss rate? (Show your work) a. A secondary cache is added between the primary cache and memory with an access time of 5ns (for either a hit or a miss). It is large enough to exhibit a 0.5% miss rate when accessed by the primary cache. b. What is the effective CPI of the processor, taking into account the primary cache miss rate and the secondary cache miss rate. (Show your work What percentage performance improvement does the secondary cache provide? c