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    SubjectRe: An idea for prefetching swapped memory...
    Am Mon, 2003-04-07 um 12.21 schrieb Con Kolivas:

    > > With this feature there should be no performance decrease because only free
    > > resources would be used, and if pages were swapped in but not be used, they
    > > stay not dirty and so have not to be written to disk when they are swapped
    > > out again. But the improvements should be obvious if simply the last swaped
    > > out pages are swapped in again...
    > This has been argued before. Why would the last swapped out pages be the best
    > to swap in? The vm subsystem has (somehow) decided they're the least likely
    > to be used again so why swap them in?

    Are you sure this is working? When I'm watching a video ofer NFS on my
    machine which is idle (just X and mplayer, gnome in background, 256 MB
    of memory, 512 swap), after 30 minutes or so, the playback starts to
    jump. The cpu usage is below 10%, and it even does this when both X and
    mplayer are renice to -19 (!). So the VM swapped everything out and
    after 30 minutes it starts to swap out X oder mplayer itself, which is
    immediately swapped back in but the video jumps... :-(

    Christophe Saout <>

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