RWMSI (Read Exclusive Write Exclusive Modified Shared Invalid) Cache Coherence Protocol

This paper proposes a novel coherence protocol RWMSI (Read exclusive Write exclusive Modified Shared Invalid) that merges “snooping and directory – based coherence protocols “and enhanced them depending on the state of “MESI snooping protocol “. “ Coherence” is implemented with “snooping or directory based protocols “. Because of the shared bus the “ Snooping protocols “ are not scalable , while directory protocols incur directory storage overhead , frequent indirections , and are more prone to design bugs