Method and apparatus for livelock prevention in a...

Details Method and apparatus for livelock prevention in a... Method and apparatus for livelock prevention in a...

2005-11-22

2005-11-22

Thai, Tuan V. (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C711S140000, C711S141000, C711S154000

Reexamination Certificate

active

06968431

ABSTRACT:
In a multiprocessor system using snooping protocols, system command conflicts are prevented by comparing processor commands with prior snoops within a specified time defined window. A determination is then made as to whether a command issued by a given processor is likely to cause a system conflict with another command issued within said specified time defined window. If so, the time of execution of any such snoop command determined as being likely to cause a system conflict is delayed. This approach uses address bus arbitration rules to prevent system livelocks due to both coherency and resource conflicts.

REFERENCES:
patent: 6029217 (2000-02-01), Arimilli et al.
patent: 6078981 (2000-06-01), Hill et al.
patent: 6202112 (2001-03-01), Gadagkar et al.
patent: 6279085 (2001-08-01), Carpenter et al.
patent: 6286068 (2001-09-01), Arimilli et al.
patent: 6546429 (2003-04-01), Baumgartner et al.

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