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    SubjectRe: [PATCH 00/33] Adaptive read-ahead V12
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    Andrew Morton <akpm@osdl.org> writes:
    >
    > These are nice-looking numbers, but one wonders. If optimising readahead
    > makes this much difference to postgresql performance then postgresql should
    > be doing the readahead itself, rather than relying upon the kernel's
    > ability to guess what the application will be doing in the future. Because
    > surely the database can do a better job of that than the kernel.

    With that argument we should remove all readahead from the kernel?
    Because it's already trying to guess what the application will do.

    I suspect it's better to have good readahead code in the kernel
    than in a zillion application.

    -Andi
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