Method and apparatus for executing self-snooped unresolvable sys

Details Method and apparatus for executing self-snooped unresolvable sys Method and apparatus for executing self-snooped unresolvable sys

1998-07-13

2000-10-31

Auve, Glenn A.

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

711146, G06F 1300

Patent

active

061417149

ABSTRACT:
A method and apparatus for preventing the occurrence of deadlocks from the execution of unresolvable system bus operations. In general, each snooper speculatively accepts a given operation when it has a snoop buffer available. However, rather than unconditionally processing the operation, the snooper waits to determine if another participant retried the operation due to unavailability of a snoop buffer. If some snooping participant retrys an operation, all snoopers that speculatively accepted an operation for processing abandon said operation. If no snooping participant retrys the operation, sufficient snooping resources were available for all necessary caches to begin processing the operation and the initiator can consider the operation completed. In other words, no operation is processed until all the necessary snooping resources are available to accept the operation. This prevents the system from getting into the ping-pong deadlock. Snoopers can safely assume that each presentation of an operation must be propagated and that no operation will have been fully or partially processed by some other snooper. The operation cannot proceed until all of the available resources are available and once available, the operation is propagated only once by those snooping resources.

REFERENCES:
patent: 5553266 (1996-09-01), Metzger et al.
patent: 5781757 (1998-07-01), Deshpande
patent: 5797026 (1998-08-01), Rhodehamel et al.
patent: 5829040 (1998-10-01), Son
patent: 5926830 (1999-07-01), Feiste

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