Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2008-06-10
2008-06-10
Thai, Tuan V. (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S118000, C711S154000
Reexamination Certificate
active
07386685
ABSTRACT:
A method and apparatus for implementing a snoop filter unit associated with a single processor in a multiprocessor system. The snoop filter unit has a plurality of ports, each port receiving snoop requests from exactly one dedicated source. Associated with each port is a snoop cache filter that processes each snoop cache request and records addresses of the most recent snoop requests for exactly one source. The snoop cache filter uses vector encoding to record the occurrence of snoop requests for a sequence of consecutive cache lines. All addresses of snoop requests are added to the snoop cache unless a received snoop cache request matches an entry present in the associated snoop cache, in which case the snoop request is discarded. Otherwise, the associated snoop cache request is enqueued for forwarding to the single processor. Information from all snoop cache filters assigned to all ports in the snoop filter unit are removed in the case that data corresponding to any one of the memory addresses contained in snoop cache filter is loaded in the cache hierarchy of the processor the snoop cache filter is assigned to.
REFERENCES:
patent: 5572701 (1996-11-01), Ishida et al.
patent: 5659710 (1997-08-01), Sherman et al.
patent: 5966729 (1999-10-01), Phelps
patent: 6085295 (2000-07-01), Ekanadham et al.
patent: 6339813 (2002-01-01), Smith et al.
patent: 6389517 (2002-05-01), Moudgal et al.
patent: 6598123 (2003-07-01), Anderson et al.
patent: 6704845 (2004-03-01), Anderson et al.
patent: 6823409 (2004-11-01), Jones et al.
patent: 7117312 (2006-10-01), Cypher
patent: 2003/0065843 (2003-04-01), Jones et al.
patent: 2003/0070016 (2003-04-01), Jones et al.
patent: 2003/0126376 (2003-07-01), Blankenship et al.
patent: 2003/0131201 (2003-07-01), Khare et al.
patent: 2003/0135696 (2003-07-01), Rankin et al.
patent: 2004/0003184 (2004-01-01), Safranek et al.
patent: 2006/0095684 (2006-05-01), Shen
Moshovos, et al., “JETTY: Filtering Snoops for Reduced Energy Consumption in SMP Servers”, The Proceedings of the 7th International Symposium on High-Performance Computer Architecture.
Blumrich Matthias A.
Gara Alan G.
Salapura Valentina
International Busniess Machines Corporation
Morris, Esq. Daniel P.
Scully , Scott, Murphy & Presser, P.C.
Thai Tuan V.
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