Architectures and Processors forum Justification for write-back of UniqueClean line for WriteEvictFull CHI opcode.

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Justification for write-back of UniqueClean line for WriteEvictFull CHI opcode.

nizam.ahmed over 2 years ago

The WriteEvictFull CHI opcode definition states the following

"Write-back of UniqueClean data to the next-level cache."..

If the line is already in UniqueClean state, why is a write-back of that line required?

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+1 Christopher Tory over 2 years ago

This can improve performance for other RNs wishing to access the same data. The latency to the next level cache may be lower than snooping a cache within the RN.
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+1 Christopher Tory over 2 years ago

This can improve performance for other RNs wishing to access the same data. The latency to the next level cache may be lower than snooping a cache within the RN.
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0 nizam.ahmed over 2 years ago in reply to Christopher Tory

Got it. Thanks.
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