Exclusive ownership snoop filter

Details Exclusive ownership snoop filter Exclusive ownership snoop filter

2006-06-29

2009-08-25

Verbrugge, Kevin (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S141000

Reexamination Certificate

active

07581068

ABSTRACT:
A snoop filter maintains data coherency information for multiple caches in a multi-processor system. The Exclusive Ownership Snoop Filter only stores entries that are exclusively owned by a processor. A coherency engine updates the entries in the snoop filter such that an entry is removed from the snoop filter if the entry exits the exclusive state. To ensure data coherency, the coherency engine implements a sequencing rule that decouples a read request from a write request.

REFERENCES:
patent: 2004/0117561 (2004-06-01), Quach et al.
patent: 2006/0080508 (2006-04-01), Hoover
patent: 2006/0224839 (2006-10-01), Blumrich et al.
patent: 2007/0294481 (2007-12-01), Hoover et al.

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