Question: > Some applications read a large dataset first, then modify most or all of it . The base MSI coherence protocol will first fetch all

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Some applications read a large dataset first, then modify most or all of it

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The base MSI coherence protocol will first fetch all of the cache blocks in the Shared state and then be forced to perform an invalidate operation to upgrade them to the Modified state. The additional delay has a significant impact on some workloads. An additional protocol optimization eliminates the need to upgrade blocks that are read and later written by a single processor.

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