can KVM use all cpu cores in a guest

can KVM use all cpu cores in a guest

[Martin Maurer]

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Hi all,

 

As far as I see I can configure 4 cpu´s in a guest (using the -smp option) –
but this seems to be only virtual, means the process on the host only uses
one physical cpu.

 

Background: I want to run just one guest, using the full cpu power of a host
(quadcore). Now I only get 25 % cpu load on the host.

 

Will this be possible with future versions?

 

Thanks,

Best Regards,

 

Martin

 

 


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Re: can KVM use all cpu cores in a guest

[Alexey Eremenko]

KVM fully uses all 4 CPUs.

1. You need to make sure KVM is activated (not Qemu).
2. You need to have the guest workload to be multi-threaded.

-- 
-Alexey Eremenko "Technologov"

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Re: can KVM use all cpu cores in a guest

[Martin Maurer]

Alexey Eremenko wrote:
> KVM fully uses all 4 CPUs.
>
> 1. You need to make sure KVM is activated (not Qemu).
> 2. You need to have the guest workload to be multi-threaded.
>
>   
Hi Alexey,

Thanks, I worked it out - I had an issue on the kernel and on my custom 
resource scheduling, now it is working with kernel 2.6.24 and the guest 
can use all 4 cpu´s. best regards,
martin


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