[Fedora-xen] How much VCPUs should be assigned to my VMs

[Rik van Riel]

Christian Reiter wrote:

> I am quite unsure about how much VCPUs should be asssigned to my domU-VMs.
> I have here an 4-way SMP Box running 3 to 4 Guests.

How much CPU time does each guest use?

A guest that occasionally needs all 4 CPUs might benefit
from having 4 VCPUs, but a guest that uses very little
CPU might hurt from doing cross-cpu synchronization
internally.