Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2004-04-29
2008-11-11
Bataille, Pierre-Michel (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S167000
Reexamination Certificate
active
07451276
ABSTRACT:
A prefetch command control apparatus is provided. A protocol slot generation unit, when receiving from a CPU a prefetch command in which a utilization time of data to be prefetched is specified, generates a protocol slot based on the utilization time and registers it in a schedule list storage unit. When receiving a regular access command, the protocol slot generation unit registers a protocol slot in a regular protocol queue storage unit. A cost evaluation unit evaluates an issuance cost of the prefetch command based on a cache retention time of data to be prefetched and evaluates an issuance cost of the regular access command based on a resource occupation cost. A protocol issuance unit decides which command shall be issued, the prefetch command or regular access command, based on the evaluation result of these issuance costs.
REFERENCES:
patent: 5835745 (1998-11-01), Sager et al.
patent: 5835967 (1998-11-01), McMahan
patent: 6314431 (2001-11-01), Gornish
patent: 6381679 (2002-04-01), Matsubara et al.
patent: 6633891 (2003-10-01), Bamford et al.
patent: 6912612 (2005-06-01), Kapur et al.
patent: 2003/0088864 (2003-05-01), Tirumalai et al.
patent: 2004/0133747 (2004-07-01), Coldewey
patent: 0 557 077 (1993-08-01), None
patent: 1096371 (2001-05-01), None
patent: 2001-344153 (2001-12-01), None
patent: 2004348175 (2004-12-01), None
patent: WO 02/08893 (2002-01-01), None
Patterson et al., “Informed Prefetching and Caching”, Dec. 1995, pp. 79-95.
Patent Cooperation Treaty, “International Search Report,” dated Feb. 3, 2006, for corresponding application No. PCT/JP2004/005777, 4 pages.
Patent Cooperation Treaty, “Written Opinion of the International Searching Authority,” dated Feb. 3, 2006, for corresponding application No. PCT/JP2004/005777, 5 pages.
Patent Cooperation Treaty, “Notification of Transmittal of the International Search Report and the Written Opinion,” dated Feb. 3, 2006, for corresponding application No. PCT/JP2004/005777, 3 pages.
Japanese Patent Office, “Notification of Reason(s) for Refusal,” for corresponding Japanese Patent Application No. JP2003-136387, Mar. 13, 2007, 4 pages.
Bataille Pierre-Michel
Fitch Even Tabin & Flannery
Sony Computer Entertainment Inc.
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