L1is the Level-1 cache, the smallest and fastest one.
LLCon the other hand refers to the last level of the cache hierarchy, thus denoting the largest but slowest cache.
ddistinguishes instruction cache from data cache. Only L1 is split in this way, other caches are shared between data and instructions.
TLBrefers to the translation lookaside buffer, a cache used when mapping virtual addresses to physical ones.
- Different TLB counters depending on whether the named address referred to an instruction or some data.
- For all data access, different counters are kept depending on whether the given memory location was read, written, or prefetched (i.e. retrieved for reading at some later time).
- The number of misses indicates how often a given item of data was accessed but not present in the cache.