Adaptive prefetch of I/O data blocks

Details Adaptive prefetch of I/O data blocks Adaptive prefetch of I/O data blocks

2006-08-08

2006-08-08

Peikari, B. James (Department: 2189)

Electrical computers and digital processing systems: memory

Address formation

Generating prefetch, look-ahead, jump, or predictive address

C712S239000, C712S237000

Reexamination Certificate

active

07089399

ABSTRACT:
In an example embodiment, an adaptive method of prefetching data blocks from an input/output device comprises predicting the address of each read operation reading a data block from the input/output device, the prediction based on the address of the immediately preceding read operation from the input/output device; tracking, for each read operation, whether each read operation reads a block data from the same address of the input/output device predicted for the read operation; and prefetching a data block for a read operation from the input/output device in accordance with the state of a state machine, the state of the state machine depending upon whether immediately preceding read operations read a data block from the same address of the input/output device predicted for the read operations.

REFERENCES:
patent: 5146578 (1992-09-01), Zangenehpour
patent: 5600817 (1997-02-01), Macon, Jr. et al.
patent: 5623608 (1997-04-01), Ng
patent: 5765213 (1998-06-01), Ofer
patent: 5867685 (1999-02-01), Fuld et al.
patent: 6078996 (2000-06-01), Hagersten
patent: 6170030 (2001-01-01), Bell

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