Re: [Qemu-devel] Windows slow boot: contractor wanted

[Rik van Riel]

On 08/22/2012 10:41 AM, Richard Davies wrote:
> Avi Kivity wrote:
> > Richard Davies wrote:
> > > I can trigger the slow boots without KSM and they have the same profile,
> > > with _raw_spin_lock_irqsave and isolate_freepages_block at the top.
> > >
> > > I reduced to 3x 20GB 8-core VMs on a 128GB host (rather than 3x 40GB 8-core
> > > VMs), and haven't managed to get a really slow boot yet (>5 minutes). I'll
> > > post agan when I get one.
> >
> > I think you can go higher than that.  But 120GB on a 128GB host is
> > pushing it.
>
> I've now triggered a very slow boot at 3x 36GB 8-core VMs on a 128GB host
> (i.e. 108GB on a 128GB host).
>
> It has the same profile with _raw_spin_lock_irqsave and
> isolate_freepages_block at the top.

That's the page compaction code.

Mel Gorman and I have been working to fix that,
the latest fixes and improvements are in the -mm
kernel already.