A Mostly-Clean DRAM Cache for Effective Hit Speculation and Self-Balancing Dispatch

Provided by: Georgia Institute of Technology
Topic: Storage
Format: PDF
Die-stacking technology allows conventional DRAM to be integrated with processors. While numerous opportunities to make use of such stacked DRAM exist, one promising way is to use it as a large cache. Although previous papers show that DRAM caches can deliver performance benefits, there remain inefficiencies as well as significant hardware costs for auxiliary structures. This paper presents two innovations that exploit the bursty nature of memory requests to streamline the DRAM cache. The first is a low-cost Hit-Miss Predictor (HMP) that virtually eliminates the hardware overhead of the previously proposed multi-megabyte MissMap structure.

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