Messages in this thread | | | Subject | Re: [Bug #12208] uml is very slow on 2.6.28 host | From | Peter Zijlstra <> | Date | Tue, 16 Dec 2008 07:56:01 +0100 |
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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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