• About Snooping vs. Directory-based coherency..

    From Wisdom91@21:1/5 to All on Sat Jul 4 15:42:20 2020

    About Snooping vs. Directory-based coherency..

    Performance Scalability of a Multi-core Web Server

    Read more here:


    As you notice above that the Address bus saturation causes
    poor scaling! And the Address Bus carries requests and
    responses for data, called snoops, and more caches mean more sources
    and more destinations for snoops that is causing the poor scaling.

    So to solve the problem of poor scalability above, you have to use Directory-based coherence that is a mechanism to handle Cache coherence
    problem in Distributed shared memory (DSM) a.k.a. Non-Uniform Memory
    Access (NUMA).

    Thank you,
    Amine Moulay Ramdane.

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