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    SubjectRe: [PATCH 0/3] Ext3 latency improvement patches
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    On Fri, Mar 27, 2009 at 5:14 PM, Jeff Garzik <jeff@garzik.org> wrote:
    > Theodore Tso wrote:
    >> OTOH, the really big databases will tend to use direct I/O, so they
    >> won't be dirtying the page cache anyway.  So maybe it's not worth the
    >
    > Not necessarily...  From what I understand, a lot of the individual
    > low-level components in cloud storage, such as GoogleFS's chunk server[1] do
    > not bypass the page cache, even though they do care about the details of
    > data caching and data consistency.

    PostgreSQL does not use direct I/O, either (except for the
    write-ahead-logs which are written sequentially and only get read
    during database recovery). I'm sure that most of MySQL's database
    engines, also don't.

    -Dave
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