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.
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