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

On 11/10/2010 06:59 PM, MargoAndTodd wrote:

Hi All,

How does KVM handle multiple cores. I have an x5650 with 6 real cores that presents itself to my OS as 12 virtual cores (hyperthreading).

Does KVM see 6 or 12 cores.

And, can I tell KVM how many cores I want it to use?

Am I misunderstanding how KVM works?

What I am after is if my guest is 100% busy, I still want some power left over for my host.

Many thanks, -T

Found this is the manual page: -smp n Simulate an SMP system with n CPUs. On the PC target, up to 255. CPUs are supported.

Okay, not very informative. On my x5650 would that be a maximum of 6 or 12 processors?

-T