Filtering snoop traffic in a multiprocessor computing system
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United States of America Patent
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May 9, 2017
Grant Date -
Jul 14, 2016
app pub date -
Mar 18, 2016
filing date -
Feb 20, 2013
priority date (Note) -
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Abstract
Filtering snoop traffic in a multiprocessor computing system, each processor in the multiprocessor computing system coupled to a high level cache and a low level cache, the including: receiving a snoop message that identifies an address in shared memory targeted by a write operation; identifying a set in the high level cache that maps to the address in shared memory; determining whether the high level cache includes an entry associated with the address in shared memory; responsive to determining that the high level cache does not include an entry corresponding to the address in shared memory: determining whether the set in the high level cache has been bypassed by an entry in the low level cache; and responsive to determining that the set in the high level cache has not been bypassed by an entry in the low level cache, discarding the snoop message.
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