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    SubjectRe: Delaying writes to disk when there's no need
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    > If the memory does get written to again before the writeout timeout
    > then yeah its used some cpu, memory, pci, etc that it didn't have
    > to.

    It will presumably also have filled the cache with the writeout data.

    > > Ultimately its all a tradeoff. Do you write now, or do you hold off
    > > and hope that you can throw away some of the writes because new stuff
    > > will home in to overwrite them?
    >
    > Yes it is a tradeoff. Having an idle disk gives more weight to "write now".

    Not necessarily. What if you are using a solid state disk which only
    allows a relatively low number of re-write cycles? What if the disk
    is spun down, and spinning it up uses a lot of power? On a laptop,
    you don't necessarily want the disk spinning up just to write one
    sector.

    John.
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