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Depending on your workload, it will.  If they depend on any custom CPU
extensions, they will miss out on them and performance will be
decreased.  My personal suggestion is to read the docs for it and use
the "smallest common denominator" in terms of CPU usage.

On Thu, Oct 27, 2016 at 11:31 AM, William Josefsson
<william.josefson at gmail.com> wrote:
> On Thu, Oct 27, 2016 at 5:20 PM, Chris Friesen
> <chris.friesen at windriver.com> wrote:
>> In your case you probably want to set both computes to have:
>>
>> [libvirt]
>> cpu_mode = custom
>> cpu_model = Haswell
>>
>
> Hi Chris, thanks!  Yerps, I finally got it working. However, I set
> cpu_model=kvm64 everywhere and it seems to work. It is listed here:
> https://wiki.openstack.org/wiki/LibvirtXMLCPUModel  hopefully 'kvm64'
> has no performance impact what cpu_model is set to, or would 'kvm64'
> as model negatively affect my VMs? thx will
>
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