["Standard" CentOS 5.5 Xen Virtualization installation.]
I'm setting up a new box on AMD Opteron platform.
I'm doing some preliminary baselines (no domUs running) with an inline
Watt/VA meter.
It appears to enable full power management Xen dom0 must have all cpus
by not limiting in kernel statement nor in xendconfig.sxp. In previous
installations I cut them back to 1 or 2.
The bonus of all cpus appears to be a 16% to 20% reduction in wattage/va
consumption at idle. Pretty substantial when I consider that my electric
utility rates have increased 75% (yep) in the past two years alone.
My question is to anyone with experience with this is will I be seeing a
significant performance hit on domU performance in either
paravirtualized or fully virtualized guests (or both)?
