I've restarted the instances that I'm using to test but no luck. I have the setting set on just the highest compute node; I tried setting it on one of my older gen compute nodes as well but because there is production load on it, I am anxious about restarting services; I did restart the nova-compute service after making the change and there was no change in behavior. Should the setting also be set on the controllers? When I look at virsh capabilities there is certainly a difference between the two 7c7 < <model>Opteron_G5</model> ---
<model>Opteron_G4</model>
9c9 < <microcode version='100665426'/> ---
<microcode version='100664894'/>
15d14 < <feature name='bmi1'/> 25c24 < <feature name='tce'/> ---
<feature name='lwp'/>
I look at the test instance on the compute node with the G5 opteron and this is in the XML <cpu mode='custom' match='exact' check='full'> <model fallback='forbid'>Opteron_G4</model> <topology sockets='1' cores='1' threads='1'/> <feature policy='require' name='vme'/> <feature policy='require' name='x2apic'/> <feature policy='require' name='hypervisor'/> <feature policy='disable' name='rdtscp'/> </cpu> This looks like it is correctly taking the CPU model that I have specified in nova.conf, yet it does not want to migrate to the Opteron_G4 node.