[pve-devel] pve-manager: add IvyBridge cpu model

[Alexandre DERUMIER]

>>Just to get the big picture, what does happen if I set my guest to this
>>cpu model, and my host is an for instance Opteron ( so there will be a
>>mismatch in cpuflags betwwen host and guest )
>>
>>Is it safe ? Is there a performance penalty ?

I think it'll will crash at boot ;) or don't start at all.

only kvm64 && qemu64 models are safe to use with any cpu model, 
because they exposed only minimal flags which exist on both amd && intel.

If you have a mixed cluster with intel/amd, you need to used kvm64|qemu64 for live migration.

if you have only intel cluster or only amd cluster, you can choose the lowest cpu model you have in the cluster to be sure that migration will work.


----- Mail original -----
De: "Emmanuel Kasper" <e.kasper at proxmox.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 3 Juin 2015 16:11:15
Objet: Re: [pve-devel] pve-manager: add IvyBridge cpu model

Hello Alexandre 

On 06/03/2015 02:21 PM, Alexandre DerHumier wrote: 
> It's already added to qemuserver for qemu 2.3 
> 
> _______________________________________________ 

Just to get the big picture, what does happen if I set my guest to this 
cpu model, and my host is an for instance Opteron ( so there will be a 
mismatch in cpuflags betwwen host and guest ) 

Is it safe ? Is there a performance penalty ? 

Manu 



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