Directory-based data transfer protocol for multiprocessor system
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United States of America Patent
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Apr 12, 2011
Grant Date -
Dec 18, 2008
app pub date -
Jun 12, 2008
filing date -
Dec 30, 2005
priority date (Note) -
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Abstract
A system for maintaining data coherency in a multiprocessor system includes a first processor having a cache and a directory, a second processor having a directory, and at least one additional processor having a directory and separate from the first and second processors. The first processor is configured to determine if a data line is not found in the cache of the first processor and forward a request for the data line to the second processor. The second processor is configured to forward the data line from the second processor to the first processor, update the directory of the second processor to reflect the data line being forwarded to the first processor, and forward a directory update message to the at least one additional processor to reflect the data line being forwarded to the first processor. An entry in the directories includes a memory address, a most recent data holder, and a line state.
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