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    SubjectRe: [PATCH] Radix-tree pagecache for 2.5
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       From: Momchil Velikov <velco@fadata.bg>
    Date: 01 Feb 2002 11:01:50 +0200

    Does cache line bounce (shared somewhere -> exclusive elsewhere) cost
    more that a simple miss (present nowhere -> exclusive somewhere) ?

    They are about equal. For coherency purposes all cpus have to listen
    to all the transactions anyways to see if they have a match in their
    L2 caches (and thus must provide the data to the requestor).

    Perhaps the exclusive somewhere --> exclusive somewhere else is a bit
    more expensive because you eat a write port for the cache line move on
    the processor providing the data.
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