METHOD AND SYSTEM FOR PROVIDING EVICTION PROTOCOL IN UNEQUAL MEMORY ACCESS COMPUTER SYSTEM

摘要

PROBLEM TO BE SOLVED: To improve a method for evicting a cache line from a loose directory by writing data from a corrected cache line back to the local system memory of a node and evicting an entry from the loose directory later. SOLUTION: First of all, when corrected data are tried to return to the system memory, a correction intended read (RWITM) transaction can be tried again by any reason except the generation of retry by a processor. In this case, the RWITM transaction is forcedly issued again to a transaction reception unit by an AutoRetry mode. Secondly, it is possible for a corrected cache line to be absent in the remote node 10b and RWITM receives an erasure response. Afterwards, the transaction reception unit of a node controller 20b returns a response to an eviction logic and completes the eviction.