Appeal No. 2006-0614
Application No. 09/652,834
The invention relates to the manner of maintaining a coherence
directory for a data block associated with a Home processor node
which receives a request for the data block from a Requestor
processor node.
Representative claim 1 is reproduced as follows:
1. A distributed multiprocessing computer system,
comprising:
a plurality of processor nodes each coupled to an associated
memory module, wherein each memory module may store data that is
shared between said processor nodes;
a Home processor node that includes a data block and a
coherence directory for said data block in an associated memory
module;
an Owner processor node that includes a copy of said data
block in a memory module associated with the Owner processor
node, said copy of said data block residing exclusively in said
memory module;
a Requestor processor node that encounters a read or write
miss of said data block and requests said data block from the
Home processor node; and
wherein said Home processor node receives the request for
the data block from the Requestor processor node, forwards the
request to the Owner processor node for the data block and
performs a speculative write of the next directory state to the
coherence directory for the data block without waiting for the
Owner processor node to respond to the request.
The examiner relies on the following references:
Arimilli et al. (Arimilli) 5,895,484 Apr. 20, 1999
Cherabuddi et al. 6,496,917 Dec. 17, 2002
(Cherabuddi) (filed Feb. 07, 2000)
Claims 1-16 stand rejected under 35 U.S.C. § 103(a). As
evidence of obviousness the examiner offers Cherabuddi in view of
Arimilli.
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