CATCH: A Mechanism for Dynamically Detecting Cache-Content-Duplication and its Application to Instruction Caches

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Provided by: European Design and Automation Association
Topic: Storage
Format: PDF
Cache-Content-Duplication (CCD) occurs when there is a miss for a block in a cache and the entire content of the missed block is already in the cache in a block with a different tag. Caches aware of content-duplication can have lower miss rates by allowing only blocks with unique content to enter a cache. This paper examines the potential of CCD for instruction caches. The authors show that CCD is a frequent phenomenon and that an idealized duplication detection mechanism for instruction caches has the potential to increase performance of an out-of-order processor, with a 2-way eight instruction per block 16KB instruction cache, often by more than 5% and up to 20%.
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