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Let’s assume a computer has a 64-byte cache block, an L2 cache that takes 7
clock cycles to get the critical 8 bytes, and then 1 clock cycle per 8 bytes + 1
extra clock cycle to fetch the rest of the block. (These parameters are similar to
the AMD Opteron.) Without critical word first, it’s 8 clock cycles for the first 8
bytes and then 1 clock per 8 bytes for the rest of the block. Calculate the average
miss penalty for critical word first, assuming that there will be no other accesses
to the rest of the block until it is completely fetched. Then calculate assuming the
following instructions read data 8 bytes at a time from the rest of the block. Compare
the times with and without critical word first.
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