victim cache definition architecture
An extension to a direct mapped cache
that adds a small, secondary, fully associative cache
to store cache blocks that have been ejected from the main cache due to a capacity or conflict miss. These ejected blocks are likely to be needed again so storing them in the secondary cache should increase performance.
Victim caches with as few as five places have been found to reduce conflict misses, especially for small, direct-mapped data caches. E.g. a four-place victim cache removed 20% to 95% (depending on program) of such misses in a 4-KB cache.