Cache miss categories of the C6000 series

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Cache miss categories of the C6000 series [Copy link]

Cache miss categories:

Distinguishing the types of misses and the causes of misses can help you choose appropriate measures to reduce or avoid misses. There are three common types of misses.

1. Conflict miss: Data is evicted due to conflict. That is, the memory location currently accessed by the CPU is mapped to the same set as the memory location just cached. In this way, due to the conflict, the row is evicted before being reused, resulting in a miss. It is precisely because of the occurrence of conflict miss that the set-associative solution is derived.

2. Capacity miss: When a conflict miss occurs, if it is caused by the cache capacity being too small and exhausted, all line frames have been allocated when the miss occurs, and the miss caused by this is called capacity miss. The solution to capacity miss is generally to reduce the amount of data per operation. From the hardware design point of view, the cache capacity should be increased as much as possible.

3. Compulsory miss: Also called "first reference miss". It occurs when data is cached from lower-level memory for the first time. This kind of miss is unavoidable, so it is called a compulsory miss.