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Energy-efficient MESI cache coherence with pro-active snoop filtering for multicore microprocessors

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2 Author(s)
Patel, A. ; Dept. of Comput. Sci., State Univ. of New York, Binghamton, NY, USA ; Ghose, K.

We present a snoop filtering mechanism for multicore microprocessors that implement coherent caches using the MESI protocol. The relatively small filter structure at each core maintains coarse-grain sharing information about regions within a page to filter out snoops. On broadcast, the sharing status of all regions within the page is collected proactively and up to 90% of unnecessary snoops are eliminated. The energy savings resulting from snoop filtering in our scheme average about 30% across the benchmarks studied for both a quad core design in 65 nm and 8-core design in 45 nm CMOS.

Published in:

Low Power Electronics and Design (ISLPED), 2008 ACM/IEEE International Symposium on

Date of Conference:

11-13 Aug. 2008

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