Scope-based cache coherence

Details Scope-based cache coherence Scope-based cache coherence

2007-12-11

2007-12-11

Sough, Hyung (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S001000

Reexamination Certificate

active

10981370

ABSTRACT:
With scope-based cache coherence, a cache can maintain scope information for a memory address. The scope information specifies caches in which data of the address is potentially cached, but not necessarily caches in which data of the address is actually cached. Appropriate scope information can be used as snoop filters to reduce unnecessary coherence messages and snoop operations in SMP systems. If a cache maintains scope information of an address, it can potentially avoid sending cache requests to caches outside the scope in case of a cache miss on the address. Scope information can be adjusted dynamically via a scope calibration operation to reflect changing data access patterns. A calibration prediction mechanism can be employed to predict when a scope calibration needs to be invoked.

REFERENCES:
patent: 7143244 (2006-11-01), Ling et al.
patent: 2003/0115402 (2003-06-01), Dahlgren et al.

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