Bandwidth reduction technique in a snooping-based...

Details Bandwidth reduction technique in a snooping-based... Bandwidth reduction technique in a snooping-based...

2008-01-01

2008-01-01

Sough, Hyung (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S146000, C711S147000

Reexamination Certificate

active

07315919

ABSTRACT:
A cluster of multiprocessing nodes uses snooping-based cache-coherence to maintain consistency among the cache memories of the multiprocessing nodes. One or more of the multiprocessing nodes each maintain a directory table that includes a list of addresses of data last transferred by cache-to-cache transfer transactions. Thus, upon a local cache miss for requested data, a multiprocessing node searches its directory table for an address of the requested data, and if the address is found in the directory table, the multiprocessing node obtains a copy of the requested data from the last destination of the requested data as indicated in the directory table. Thereafter, a message indicating the completion of a cache-to-cache transfer is broadcast to other connected multiprocessing nodes on a “best efforts” basis in which messages are relayed from multiprocessing node to multiprocessing node using low priority status and/or otherwise unused cycles.

REFERENCES:
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patent: 2005/0198187 (2005-09-01), Tierney et al.
patent: 2005/0240735 (2005-10-01), Shen et al.

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