Title:
CONTROL OF PREFETCH COMMAND FOR DATA EXTENDED WITH SPECIFICATION OF THE UTILIZATION TIME OF THE DATA
Document Type and Number:
WIPO Patent Application WO2004102392
Kind Code:
A3
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.
Inventors:
OHBA AKIO (JP)
Application Number:
PCT/JP2004/005777
Publication Date:
March 23, 2006
Filing Date:
April 22, 2004
Export Citation:
Assignee:
SONY COMPUTER ENTERTAINMENT INC (JP)
International Classes:
G06F9/38; G06F9/30; G06F9/32; G06F9/34; G06F9/45; G06F12/08; G06F12/12
Domestic Patent References:
| WO2002008893A1 | 2002-01-31 |
Foreign References:
| US20030088864A1 | 2003-05-08 | |||
| US6381679B1 | 2002-04-30 | |||
| US5835745A | 1998-11-10 | |||
| EP1096371A1 | 2001-05-02 |
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