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Re: [Xen-users] vcpus higher than real cpus possible?



But best approach is to use VCPUs same as real CPUs to achieve best performace right?

Thanks,
 
D.

On Sat, May 17, 2008 at 10:32 PM, Stefan de Konink <skinkie@xxxxxxxxx> wrote:
On Sat, 17 May 2008, [ISO-8859-2] David Hláèik wrote:

> Hello, i have just migrated machine to xen server where only 2 cpus are
> available. I have copied config from machine where domU was located before.
> That machine had 4 CPUS (QUADCORE), current machine has 2 CPUS (1 XEON
> 2cores).
>
> I have forgot to change vcpus from 4 to 2 in config, but .. what really
> surprised me ... machine started . How it is possible? It was really slow
> alltought and not possible for working (Windows server 2003).

Since Xen is always doing this :) Think for one processor having 2 DomU's
running. Technically you have then 3 vcpu's on the same moment. It is just
about scheduling tasks for a vcpu.


Stefan


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