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    SubjectRe: [PATCH] deadline io scheduler
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       From: Andrew Morton <akpm@digeo.com>
    Date: Wed, 25 Sep 2002 23:15:58 -0700

    I'd like to gain a solid understanding of what these three knobs do.
    Could you explain that a little more?

    My basic understanding of fifo_batch is:

    1) fifo_batch is how many contiguous requests can be in
    a "set"

    2) we send out one write "set" for every two read "sets"

    3) a seek works out to "seek_cost" contiguous requests,
    cost wise, this gets subtracted from how many requests
    the current "set" has left that are allowed to be used
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