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    SubjectRe: [PATCH] Time sliced CFQ #2
    On Sat, Dec 04, 2004 at 11:49:21AM +0100, Jens Axboe wrote:
    > Hi,
    > Second version of the time sliced CFQ. Changes:
    > - Sync io has a fixed time slice like before, async io has both a time
    > based and a request based slice limit. The queue slice is expired when
    > one of these limits are reached.
    > - Fix a bug in invoking the request handler on a plugged queue.
    > - Drop the ->alloc_limit wakeup stuff, I'm not so sure it's a good idea
    > and there are probably wakeup races buried there.
    > With the async rq slice limit, it behaves perfectly here for me with
    > readers competing with async writers. The main slice settings for a
    > queue are:
    > - slice_sync: How many msec a sync disk slice lasts
    > - slice_idle: How long a sync slice is allowed to idle
    > - slice_async: How many msec an async disk slice lasts
    > - slice_async_rq: How many requests an async disk slice lasts

    This looks very nice. And from your previous post (with version #1) it
    would look like you made my attempt at io priorities easier. We'll see

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