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    SubjectRe: ORBS Elevator...
    On Sat, 29 Jul 2000, Andrea Arcangeli wrote:

    > On Sat, 29 Jul 2000, Andre Hedrick wrote:
    >
    > >This is the first case where the "elevator" an be used as a strong boost.
    >
    > I'm curious to see how much difference it will make. To try it out you
    > should tell us where are you going to store the geometry information. I
    > don't care of a real sane geometry API at the moment, just make an hack to
    > provide that info to the elevator layer (in a static variable as worse).
    > Then I or Jens can make a patch to make the elevator to use such
    > new information for the interesting HD instead of the blocknr.

    | +------ LBA 0 top of platter.
    | +----- LBA End top of platter.
    |-----------------------------------
    |
    +--- axis of rotation.

    We do a C or inverted Q position loop, real basic stuff for prediction by
    knowing the characteristic of the media in a documented way.

    > I'm actually doing VM benchmarking, if you need that elevator change fast
    > you can ask Jens too (you can keep me in CC of course).
    >
    > Andrea
    >

    Andre Hedrick
    The Linux ATA/IDE guy


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