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CMO and Non-CMO transactions in CHI

verif_engg

What exactly is for CMO and Non-CMO transactions? When CMO will be used and when Non-CMO will be used in CHI?

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    The comparison between CMOs and non-CMOs is typically considered in the context of Dataless transactions - i.e. transactions that do not transfer any data directly.  The difference between them is that they have a different purpose, even if the behaviour may be similar.

    CMOs are used to invalidate or clean data from caches.

    Non-CMOs serve other functions, such as:

    • Obtaining permission to store to a cache.

    • Updating the state of a snoop filter.

    • Moving data closer to the point of expected future use.

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  • 0

    The comparison between CMOs and non-CMOs is typically considered in the context of Dataless transactions - i.e. transactions that do not transfer any data directly.  The difference between them is that they have a different purpose, even if the behaviour may be similar.

    CMOs are used to invalidate or clean data from caches.

    Non-CMOs serve other functions, such as:

    • Obtaining permission to store to a cache.

    • Updating the state of a snoop filter.

    • Moving data closer to the point of expected future use.

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