Directory for multi-node coherent bus

Details Directory for multi-node coherent bus Directory for multi-node coherent bus

2007-07-26

2010-02-23

Verbrugge, Kevin (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S141000

Reexamination Certificate

active

07669013

ABSTRACT:
A method for maintaining cache coherency for a multi-node system using a specialized bridge which allows for fewer forward progress dependencies. A look-up of a local node directory is performed if a request received at a multi-node bridge of the local node is a system request. If a directory entry indicates that data specified in the request has a local owner or local destination, the request is forwarded to the local node. If the local node determines that the request is a local request, a look-up of the local node directory is performed. If the directory entry indicates that data specified in the request has a local owner and local destination, the coherency of the data on the local node is resolved and a transfer of the request data is performed if required. Otherwise, the request is forwarded to all remote nodes in the multi-node system.

REFERENCES:
patent: 6405289 (2002-06-01), Arimilli et al.
patent: 6901485 (2005-05-01), Arimilli et al.

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