Using Counter Cache Coherence to Improve Memory Encryptions Performance in Multiprocessor Systems

When memory encryption schemes are applied in multiprocessor systems, the systems will confront new problems such as inter-processor communication overhead increasing and cache coherence protocol overhead increasing. A counter cache coherence optimization scheme AOW is proposed to improve cache hit rate. As MESI protocol which makes counter line by four states, AOW marks each counter line using three encryption states, 'Autonomy', 'Operating' and 'Waiting'. According to the simulation results, by applying AOW, memory access time decreases, and execution speed of non-AOW method improves obviously.