Q51

Consider a $2$-way set associative cache with $256$ blocks and uses $\text{LRU}$ replacement. Initially the cache is empty. Conflict misses are those misses which occur due to the contention of multiple blocks for the same cache set. Compulsory misses occur due to first time access to the block. The following sequence of access to memory blocks : $\big \{0,128,256,128,0,128,256,128,1,129,257,129,1,129,257,129 \big \}$ is repeated $10$ times. The number of conflict misses experienced by the cache is _________ .