Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2005-07-11
2008-10-14
Song, Jasmine (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S119000, C711S141000
Reexamination Certificate
active
07437520
ABSTRACT:
In a network-based cache-coherent multiprocessor system, when a node receives a cache request, the node can perform an intra-node cache snoop operation and forward the cache request to a subsequent node in the network. A snoop-and-forward prediction mechanism can be used to predict whether lazy forwarding or eager forwarding is used in processing the incoming cache request. With lazy forwarding, the node cannot forward the cache request to the subsequent node until the corresponding intra-node cache snoop operation is completed. With eager forwarding, the node can forward the cache request to the subsequent node immediately, before the corresponding intra-node cache snoop operation is completed. Furthermore, the snoop-and-forward prediction mechanism can be enhanced seamlessly with an appropriate snoop filter to avoid unnecessary intra-node cache snoop operations.
REFERENCES:
patent: 7174430 (2007-02-01), O'Krafka et al.
patent: 2003/0065843 (2003-04-01), Jones et al.
patent: 2005/0240735 (2005-10-01), Shen et al.
Shen Xiaowei
Strauss Karin
F. Chau & Associates LLC
International Business Machines - Corporation
Song Jasmine
LandOfFree
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