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Question 4 : Consider the usage of critical word first and early restart on L 2 cache misses. Assume a 1 MB L 2 cache
Question : Consider the usage of critical word first and early restart on L cache misses. Assume a MB L cache with byte blocks and a refill path that is bytes wide. Assume that the L can be written with bytes every processor cycles, the time to receive the first byte block from the memory controller is cycles, each additional byte block from main memory requires cycles, and data can be bypassed directly into the read port of the L cache. Ignore any cycles to transfer the miss request to the L cache and the requested data to the L cache. a How many cycles would it take to service an L cache miss with and without critical word first and early restart? b Do you think critical word first and early restart would be more important for L caches or L caches, and what factors would contribute to their relative importance?
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