REMOVAL OF INVALIDATION TRANSACTION FROM SNOOP FILTER

摘要

PPROBLEM TO BE SOLVED: To solve a problem, when a cache line in one cache level or snoop filter is evicted, the cache line corresponding to another level of a cache hierarchy is evicted in order to keep the cache hierarchy, and, when the snoop filter transmits many such requests, the interconnection bandwidth of increasing an effective memory latency is consumed and useful cache entry is removed. PSOLUTION: This removing method includes steps of: receiving an indication of a pending capacity eviction from a caching agent; determining whether an invalidating write back transaction from the caching agent is likely for a cache line associated with the pending capacity eviction; and, if so, moving a snoop filter entry associated with the cache line from the snoop filter to a staging area. PCOPYRIGHT: (C)2010,JPO&INPIT