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    SubjectRe: [Bug #12208] uml is very slow on 2.6.28 host
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    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>

    Miklos


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