This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


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

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>

Xen-users mailing list