KVM vs bare metal performance difference

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bogesman

Renowned Member
Aug 7, 2015
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What is the expected difference in percents between windows guest allocated with all host resources and the same server?
According to these tests https://major.io/2014/06/22/performance-benchmarks-kvm-vs-xen/ it's very little, but that's for a linux guest.
I'm testing on 2 socket numa enabled MB and i see CPU performance loss of around 40%.
Tested so far WIN7 with virtio network and hdd. Ballooning and fixed memory allocation no difference.
 
You should tell more about your hardware and your performancetests...
Disabling ballooning should improve windows - performance...
 
I do one simple test, because all i care is CPU performance and that is maxon cinebench.
So if I bench for 14 points in the same server with windows as host, in kvm i get around 8 points.

MB is Asus Z9NA-D6 with 2XCPU - Xeon E5-2450
 
So can can at least somebody tell me what is it the expected CPU performance if windows is guest ?
-5 -10 or -40%. I'm having hard time finding some conclusive test or at least simple statement.
 
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