Question

For a cache lookup to be a hit, which of the following must be true.

A. Tag==Block Offset and Valid Bit=1

B.. Tag==Block Offset and Valid Bit=0

C. Tag==Block Number and Valid Bit=1

D. Tag==Block Number and Valid Bit=0

Answer 1

block number and valid bit 1

Answer 2

The correct option is C. Tag==Block Number and Valid Bit=1.

There are three performance metrics of cache i.e. hit time, miss rate and miss penalty.

Hit time is the time of delivering a line in cache to processor.

It also includes the time for determining whether the line is in cache.