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    SubjectRe: [RFC] kernel facilities for cache prefetching
    On Tue, May 02, 2006 at 10:55:29AM +0200, Arjan van de Ven wrote:
    > > Yes, I find it hard to improve the boot time of the init.d stage.
    > > However, it is perfectly ok to preload all GUI staffs during that
    > > timespan, by overlapping CPU/IO activities.
    >
    > fwiw fedora even loads a bunch of GUI apps into memory already

    Hopefully the warm cache time has been improving.
    I have very good performance with fluxbox. Lubos Lunak said
    (http://wiki.kde.org/tiki-index.php?page=KDE%20Google%20SoC%202006%20ideas#id106304)
    that "KDE startup with cold caches is several times slower than with
    warm caches." The latest GNOME release also saw good speedup.

    > > > Another interesting approach would be to actually put all the data you
    > > > want to use in a non-fragmented, sequential area on disk somehow (there
    > > > is an OLS paper submitted about that by Ben) so that at least the disk
    > > > side is seekless...
    > >
    > > You are right, reducing seeking distances helps not much. My fluxbox
    > > desktop requires near 3k seeks, which can be loaded in the 20s init.d
    > > booting time. But for KDE/GNOME desktops, some defragging would be
    > > necessary to fit them into the 20s time span.
    >
    > or just move the blocks (or copy them) to a reserved area...

    Ah, we can save discontinuous pages into the journal file on umounting
    and restore them on mounting. But let's do the simple way first :)

    Wu
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