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    SubjectRe: x86 status was Re: -mm merge plans for 2.6.23
    Hi Andi,

    On Wed, Jul 11, 2007 at 11:16:38PM +0200, Andi Kleen wrote:
    > I thought it was clear that rip everything out is rarely a good idea
    > in Linux land? That's really not something I should need to harp on
    > repeatedly.

    I'm going to change topic big time because your sentence above
    perfectly applies to the O(1) scheduler too. It's not like process
    schedulers are sacred and there shall be only one, while I/O
    schedulers and packet schedulers are profane and there can be many of
    them. FWIW IMHO the right way would have been to make the new
    scheduler pluggable and switchable at runtime, too bad it was ripped
    off instead. The difficulty of making the scheduler pluggable isn't
    really enormous, there have been patches floating around to achieve
    it, some I even deal with them myself once.

    The only positive side of being forced to CFS I can imagine, is that
    more testing will make it more stable and more tuned more quickly. But
    I'm fairly certain Ingo's good enough to achieve without it, perhaps
    with a few more weeks.

    Personally I very much like the unfariness of O(1), I'm afraid CFS
    will overschedule under a certain number of workloads in its attempt
    to provide a complete fair queieing at all costs, and it won't deal
    with the X server as nicely as O(1), but I may as well be wrong. The
    only thing I'm more sure about is that the computational complexity is
    higher, and that reason alone is a good technical reason to provide
    both and let the java folks stick with O(1) if they want.
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