Snoop filter bypass

Details Snoop filter bypass Snoop filter bypass

2006-08-15

2006-08-15

Bataille, Pierre-Michel (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S146000, C711S137000

Reexamination Certificate

active

07093079

ABSTRACT:
Machine-readable media, methods, and apparatus are described for processing coherent requests of a computing device comprising multiple cache nodes. In some embodiments, a coherent switch may receive from a requesting cache node a coherent request for a line of memory. The coherent switch may further issue snoop requests to one or more non-requesting cache nodes based upon whether a snoop filter bypass mode is enabled. In particular, the coherent switch when not in snoop filter bypass mode may obtain coherency data from a snoop filter and may issue snoop requests to zero or more non-requesting cache nodes based upon the coherency data obtained from the snoop filter. Further, the coherent switch when in snoop filter bypass mode may bypass the snoop filter and may issue snoop requests to all non-requesting cache agents.

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U.S. Appl. No. 10/046,768, filed Jan. 17, 2002. Title: Pseudo least-recently-used (PLRU) replacement method for a multi-node snoop filter. Inventors: Linda J. Rankin and Kai Cheng. Specification pp. 1-25 including abstract. Drawings 4 sheets; Figures 1, 2, 3 and 4.
U.S. Appl. No. 09/643,382, filed Aug. 21, 2000. Title: Method and apparatus for centralized snoop filtering. Inventors: Manoj Khare, Faye A. Briggs, Kai Cheng and Lily Pao Looi. Specification pp. 1-15 including abstract. Drawings 4 sheets; Figures 1, 2, 3 and 4.
U.S. Appl. No. 09/752,534, filed Dec. 29, 2000. Title: Mechanism for efficiently supporting the full MESI (modified, exclusive, shared, invalid) protocol in a cache coherent multi-node shared memory sytem. Inventors: Manoj Khare, Lily P. Looi, Akhilesh Kumar and Faye A. Briggs. Specification pp. 2-22 including abstract. Drawings 9 sheets; Figures 1, 2, 3, 4, 5, 6, 7, 8, and 9.
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Moshovos et al. “Jetty: Filtering Snoops for Reduced Energy Consumption in SMP Servers” HPCA: The seventh International Symposium on High-Performance Computer Architecture, Jan 19-24, 2001.

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