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RE: [Xen-users] vcpus questions!

  • To: "Rodrigo Lord" <lord.listas@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Fri, 13 Apr 2007 14:34:15 +0200
  • Delivery-date: Fri, 13 Apr 2007 05:41:24 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: Acd9xzUlXdrsy/hGSoCsT5cqO/Ih7AAAEQLw
  • Thread-topic: [Xen-users] vcpus questions!


> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Rodrigo Lord
> Sent: 13 April 2007 13:27
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] vcpus questions!
> Hi!
> I`m testing xen...
> and I tried to load 20 vcpus! but just 8 vcpus works!
> Is there a maximum number of vcpus that I can load?
> How porcentage each vcpus get of the physical CPU ? And how 
> can I configure it?

You should be able to use more than 8 VCPU's in one guest - however, you
can't use more VCPU's at any given time than the number of physical
cores in the machine, so to run more than 8 VCPU's at once, you need
something like a 
4-socket machine with quad-core processors or 8-socket machine with dual
core processors (or 16 socket machine with single core processors)
[assuming we take the standard 2^n processor configurations - of course
there are several permutations of odd-number sockets that would also
allow more than 8 VCPU's]. 

Note that also some OS's have limits of how many CPU's they allow in any
particular distribution/configuration, so this may also limit the number
of CPU's actively working. 

> Thanks!
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

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