[pve-devel] Optimizing CPU flags

Stefan Priebe s.priebe at profihost.ag
Fri Jan 30 22:23:17 CET 2015

on stackoverflow i read that vmware and RHEV / oVirt already do this in 

"For mixed clusters, use the lowest available CPU version, so if one 
host is Penryn and the other Nehalem, use Penryn on both. If you are 
using RHEV or oVirt, this is already built in. VMWare have this called 
"EVC" and position it as a huge feature."

I think somethink like this for proxmox instead of using kvm64 as a 
default would be great!


Am 30.01.2015 um 21:53 schrieb Stefan Priebe:
> Hi,
> is there any way or has anybody thought about optimizing the cpu flags
> in pve automatically?
> Currently the default is kvm64 which is more like a very limited set of
> cpu flags/features which qemu can software emulate.
> For example on a modern intel CPU there is a really big bunch of
> features missing for guests:
> avx, sse3, sse4.1, sse4.2, aes, many more
> Has anybody ever thought about optimizing this?
> Stefan

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