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From Edison Su <Edison...@citrix.com>
Subject RE: Cloudstack + kvm : set arch = i686
Date Tue, 27 Nov 2012 21:06:44 GMT


> -----Original Message-----
> From: Julien Garet [mailto:julien.garet@inria.fr]
> Sent: Tuesday, November 27, 2012 11:02 AM
> To: cloudstack-users@incubator.apache.org
> Cc: cloudstack-users@incubator.apache.org
> Subject: Re: Cloudstack + kvm : set arch = i686
> 
> 
> Le 27 nov. 2012 à 17:51, David Nalley <david@gnsa.us> a écrit :
> 
> > On Tue, Nov 27, 2012 at 11:40 AM, Julien Garet <julien.garet@inria.fr>
> wrote:
> >> Hello,
> >>
> >>
> >> We have discovered something today we didn't expect... We are using CS
> 3.0.2 with KVM hypervisors. Our users want to be able to use 32 or 64 bits
> VMs, so, we have set up templates using 32 or 64 bits OSes (setting OS type
> 32 or 64 bits accordingly), but that does not have any impact on the VM
> deployed... arch option in the domain xml file is x86_64, whatever we choose
> as OS Type.
> >>
> >>
> >> Is there a way to deploy 32bits VMs on 64bits hypervisors ?
> >>
> >>
> >
> > The arch of the operating system is different than the arch of the
> > virtualized CPU (which is what I think you are referring to).
> > What benefit do you expect to extract from having a virtualized 32bit
> > CPU compared to a virtualized 64bit cpu? Do users that have physical
> > machines in your environment note that you deployed a 32bit OS on a
> > 64bit CPU?
> 
> Our users are doing continous integration on the instances and they have
> noticed it wasn't a virtualized 32bits cpu ;-) It's a pain to work for researchers
> in computer science ! :-D
> 
> The idea behind is KVM permits 32bit virtualization on 64bits hardware, and
> it's quite frustrating to just hide the truth (32bits OS on 64bits hardware).
> 
> Do we have a way to set kvm options on the guests or have Cloudstack force
> 32bits virtualization on 32bits templates ?

Can you fire a bug about it? If the template is 32bit, need to set the cpu as 32bit.

> 
> >
> > --David
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