Method and system for speculatively sourcing cache memory data p

Details Method and system for speculatively sourcing cache memory data p Method and system for speculatively sourcing cache memory data p

1997-04-14

1999-07-13

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711141, 711137, G06F 1300

Patent

active

059241187

ABSTRACT:
A method and system for speculatively sourcing data among cache memories within a multiprocessor data-processing system is disclosed. In accordance with the method and system of the present invention, the data-processing system has multiple processing units, each of the processing units including at least one cache memory. In response to a request for data by a first processing unit within the data-processing system, an intervention response is issued from a second processing unit within the data-processing system that contains the requested data. The requested data is then sourced from a secondary cache memory within the second processing unit onto a system data bus concurrently with invalidating a copy of the requested data from a primary cache within the second processing unit. During this time, the second processing unit is also pending for a combined response to return from all the processing units.

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