Non-speculative distributed conflict resolution for a cache...

Details Non-speculative distributed conflict resolution for a cache... Non-speculative distributed conflict resolution for a cache...

2005-10-11

2005-10-11

Lane, Jack A. (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S141000, C709S216000, C709S230000, C709S238000

Reexamination Certificate

active

06954829

ABSTRACT:
A conflict resolution technique provides consistency such that all conflicts can be detected by at least one of the conflicting requestors if each node monitors all requests after that node has made its own request. If a line is in the Exclusive, Modified or Forward state, conflicts are resolved at the node holding the unique copy. The winner of the conflict resolution, and possibly the losers, report the conflict to the home node, which pairs conflict reports and issues forwarding instructions to assure that all requesting nodes eventually receive the requested data. If a requested cache line is either uncached or present only in the Shared state, the home node provides a copy of the cache node and resolves conflicts. In one embodiment, a blackout period after all responses until an acknowledgement message has been received allows all conflicting nodes to be aware of conflicts in which they are involved.

REFERENCES:
patent: 6275905 (2001-08-01), Keller et al.
patent: 6640287 (2003-10-01), Gharachorloo et al.
Jim Handy, “The Cache Memory Book,” Second Edition, 1998, pp. vii-229, Academic Press Limited, London, United Kingdom.
“IEEE Standard for Scalable Coherent Interface (SCI),” IEEE Std 1596-1992, 1992, pp. i-243, Institute of Electrical and Electronics Engineers, Inc., USA.
“UltraSPARC User's Manual, UltraSPARC-I, UltraSPARC-II,” Jul. 1997, pp. iii-394, Sun Microsystems, USA.

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