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Consider a cache with a line size of 64 bytes. Assume that on average 30% of the lines in the cache are dirty. A word consists of 8 bytes. Assume there is a 3% miss rate (0.97 hit ratio). Compute the amount of main memory traffic, in terms of bytes per instruction for both write-through and write back policies. Memory is read into cache one line at a time. However, for write back, a single word can be written from cache to main memory.
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This one is from Stallings book exercise.

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