[pve-devel] KVM with same cores as host is as slow as one core

Stefan Priebe - Profihost AG s.priebe at profihost.ag
Fri Jul 19 09:07:27 CEST 2013


Hi,

while benchmarking my kvm machines using unixbench i see the following
reproducable behaviour.

Host has 24 cores.

KVM Machine set to 2 cores: Unixbench Value 2514
KVM Machine set to 16 cores: Unixbench Value 6714
KVM Machine set to 24 cores: Unixbench Value 1742

Also i see a max of 105% CPU Usage of the KVM process when setting the
cores to 24.

While i'm seeing more than 1000% setting it to 16 cores.

Stefan


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