[CentOS-virt] How does KVM handle multiple cores?

Guillaume Taglang

taglang at lifebiosystems.com
Mon Nov 22 14:04:54 UTC 2010

MargoAndTodd wrote:
> My big concern here is that if I tell it 4 cores on my customer's
> x5650 (6 hardware cores), I will actually get 4 hyperthreaded cores
> for a total of 2 actual cores.

It's how it works, think of kvm as an application. If you tell that it 
should use 4 core it's like if you tell it to use 4 processes or 
threads. The host operating system will decide which processor core or 
thread to use ...


Guillaume Taglang
Director IT
LIFE Biosystems
phone:  +49 6221 438 5367
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LIFE Biosystems GmbH
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                  Dr. Hartmut Voss
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