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KVM vs Hyper-V. Which hypervisor is best for windows guests ?

I am currently testing openstack for windows guests (XP and 7). I have deployed openstack "all in one" on system with following specs

Processor corei5. (4 physical cores and 8 Threads with HT Technology)


HD 500 GB.

I have created 4 windows xp guests with 512MB RAM and 1VCPU.

On each windows guest i have installed visual studio 2008 only.

In nova.conf CPU Over-Commit ratio is 2 for better performance (as mentioned in openstack operation guide).

Using KVM as hyerpvisor.

I have observed poor performance when simultaneously using visual studio in four windows instances. How i can improve performance ? Should i use KVM or Hyper-V