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    SubjectRe: [Bug #12208] uml is very slow on 2.6.28 host
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    On Tue, 2008-12-16 at 01:49 +0100, Miklos Szeredi wrote:
    > On Sat, 13 Dec 2008, Rafael J. Wysocki wrote:
    > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12208
    > > Subject : uml is very slow on 2.6.28 host
    > > Submitter : Miklos Szeredi <miklos@szeredi.hu>
    > > Date : 2008-12-12 9:35 (2 days old)
    > > References : http://marc.info/?l=linux-kernel&m=122907463518593&w=4
    >
    > I did a bisection, and this is the commit which is responsible:
    >
    > commit 464b75273f64be7c81fee975bd6ca9593df3427b
    > Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Date: Fri Oct 24 11:06:15 2008 +0200
    >
    > sched: re-instate vruntime based wakeup preemption
    >
    > The advantage is that vruntime based wakeup preemption has a better
    > conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'.
    > Therefore wakeup_gran is the granularity of unfairness we allow in order
    > to make progress.
    >
    > Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Acked-by: Mike Galbraith <efault@gmx.de>
    > Signed-off-by: Ingo Molnar <mingo@elte.hu>

    How's 27? That code basically makes .28 do what .27 did, we tried
    something else for a little while and that made stuff suck rocks.



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