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Cache coherence protocols such as MESI that use writer-initiated invalidationhave high complexity and sometimes have poor performance and energy usage,especially under false sharing. Such protocols require numerous transientstates, a shared directory, and support for core-to-core communication, whilealso suffering under false sharing. An alternative to MESI's writer-initiatedinvalidation is self-invalidation, which achieves lower complexity than MESIbut adds high performance costs or relies on programmer annotations or specificdata access patterns.  This paper presents Neat, a low-complexity, efficient cache coherenceprotocol. Neat uses self-invalidation, thus avoiding MESI's transient states,directory, and core-to-core communication requirements. Neat uses novelmechanisms that effectively avoid many unnecessary self-invalidations. Anevaluation shows that Neat is simple and has lower verification complexity thanthe MESI protocol. Neat not only outperforms state-of-the-art self-invalidationprotocols, but its performance and energy consumption are comparable to MESI's,and it outperforms MESI under false sharing.

Neat: Low-Complexity, Efficient On-Chip Cache Coherence