Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2006-11-16
2010-06-08
Song, Jasmine (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S141000, C709S201000, C709S202000, C709S217000, C712S028000
Reexamination Certificate
active
07734876
ABSTRACT:
In a data processing system, a plurality of agents communicate operations therebetween. Each operation includes a request and a combined response representing a system-wide response to the request. Within data storage in the data processing system, a data structure indicates a duration of a protection window extension for each of the plurality of agents. Each protection window extension is a period following receipt of a combined response during which an associated one of the plurality of agents protects transfer of coherency ownership of a data granule between agents. Each of the plurality of agents is configured with a duration of a protection window extension by reference to the data structure, and at least two of the agents have protection window extensions of differing durations. The plurality of agents thereafter employ the configured protection window extensions.
REFERENCES:
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Clark et al..; “Data Processing System, Method and Interconnect Fabric That Protect Ownership Trasfer With Non-Unifrom Protection Windows” 45 Pages; to be filed concurrently.
Fields, Jr. James S.
Goodman Benjiman L.
Guthrie Guy L.
Starke William J.
Stuecheli Jeffrey A.
Dillon & Yudell LLP
International Business Machines - Corporation
Song Jasmine
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