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    SubjectRe: [PATCH] mm - implement swap prefetching
    Date
    On Tue, 11 Oct 2005 00:35, Jesper Juhl wrote:
    > On 10/10/05, Con Kolivas <kernel@kolivas.org> wrote:
    > > Andrew could you please consider this for -mm
    > >
    > > Small changes to the style after suggestions from Pekka Enberg (thanks),
    > > and changed the default size of prefetch to gently increase with size of
    > > ram. Functionally this is the same code as vm-swap_prefetch-15 and I
    > > believe ready for a wider audience.
    >
    > + What this will do on workstations is slowly bring back applications
    > + that have swapped out after memory intensive workloads back into
    > + physical ram if you have free ram at a later stage and the machine
    > + is relatively idle. This means that when you come back to your
    > + computer after leaving it idle for a while, applications will come
    > + to life faster. Note that your swap usage will appear to increase
    > + but these are cached pages, can be dropped freely by the vm, and it
    > + should stabilise around 50% swap usage.
    > +
    > + Desktop users will most likely want to say Y.
    >
    > How about a little note about the impact for server users as well?
    > You recommend that desktop users enable this, but you don't give any
    > recommendation for servers.

    Your guess is as good as mine. I can easily demonstrate a benefit when using
    it with desktop workloads but a server? It's not expensive to run but I don't
    really know if it's advantageous either. If I had to take a guess, a server
    that had multiple user logins running applications would benefit, but
    database, web servers etc I doubt would benefit.

    Cheers,
    Con
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