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

[Peter Booth <peter_booth@xxxxxxx>]

Nick,

How many vcpus does Dom0 have?

Peter

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>
> http://www.cmdln.org
>
>
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