Open Stack

Suppose I have an OpenStack undercloud, deployed on some Intel Xeon 
E5-2670 boxes running Ubuntu 12.04.  In /proc/cpuinfo I see the following 
flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb 
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 
ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt 
tsc_deadline_timer aes xsave avx lahf_lm ida arat epb xsaveopt pln pts 
dtherm tpr_shadow vnmi flexpriority ept vpid.

Suppose I create a VM in that undercloud, and use DevStack to install 
OpenStack overcloud inside that VM.  Suppose I create some VMs in that 
overcloud.  Now I am doing nested virtualization.  I am told the speed 
with which the overcloud VMs run can vary greatly, depending on certain 
configuration details.  What do I need to do to get my overcloud to create 
fast VMs?

Following are a couple of remarks I got from one source; do they look 
right?

For Ubuntu host, you may try add/replace this line in /etc/modules if it 
is an Intel box:

options kvm-intel nested=1

If the host machine is a AMD box, you don't have to specify the 'nested=1' 
parameter.

The second option for nova.conf can be added directly to the [DEFAULT] 
section, if it is not there.  This is also meant for the 'physical' host.

libvirt_cpu_mode = host-passthrough


Thanks,
Mike
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