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    SubjectRe: [PATCH 00/33] Adaptive read-ahead V12
    Date
    On Saturday 27 May 2006 10:00, Con Kolivas wrote:
    > On Saturday 27 May 2006 09:54, Folkert van Heusden wrote:
    > > > > 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.
    > >
    > > Maybe a pluggable read-ahead system could be implemented.
    >
    > Pluggable anything is unpopular with Linus and other maintainers. See
    > pluggable cpu scheduler and pluggable page replacement policy (vm)
    > patchsets.

    Sorry I should have been clearer. The belief is that certain infrastructure
    components do not benefit from a pluggable framework, and readeahead probably
    comes under that description. It's not like Linus was implying we should only
    have one filesystem for example, since filesystems are afterall pluggable
    features.

    --
    -ck
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