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Re: [Xen-users] Xen system hang or freeze


How many vcpus does Dom0 have?


On Apr 21, 2009, at 2:42 PM, Nick Anderson wrote:

On Tue, Apr 21, 2009 at 12:31:04PM -0400, Peter Booth wrote:
Some thoughts:
0. Do you have the default behavior where the guests independent
wallclocks are disabled?
Yes I did not change anything relating to that.

1. I have observed visible performance differences from a VM when %steal
goes above 1%.
It sounds like you have 8 cores.
How many VMs do you have?
What are their weights and caps?

I do have 8 cores .... 2 quad core AMD
I have 3 domUs each with a single vcpu no pinning, weight or caps just
the single vcpu per domU.

2. The system default of collecting sar every ten minutes is pretty
unhelpful for problem diagnosis. I routinely adjust this to interval to
five seconds, which for the expense of a lot of disk space, gives a
historical dataset that is useful for forensics.

I might try taking it down to the 1 minute mark first.
Should I do this in a guest as well as the host?

Nick Anderson <nick@xxxxxxxxxxxx>

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