Re: [libvirt-users] CPU Resource Reservation using KVM
On 4/13/2015 1:18 PM, Kashyap Chamarthy wrote:
On Mon, Apr 13, 2015 at 12:14:12PM +0530, Jatin Davey wrote:
> Hi All
>
> I am new to KVM world. I have been using VMware for about a year.
>
> In VMware world we can reserve cpu resources for a VM. Say for instance if
> we need 4 vCPUs with a total of 8000 GHz then we can mention this
> configuration in vCenter while creating a VM. This guarantees 8000 GHz of
> cpu resources for the deployed VM.
>
> How can i achieve the same thing using KVM ?
If you are comfortable with command line, you can look at `virsh` manual
page for
setvcpus - change number of virtual CPUs
to control how many vCPUs you can allocate.
If you're using `virt-manager`, you should be able to control it via UI
for a guest under its "Show virtual hardware details" and look for
"Processor".
I have looked at virsh and more specifically "setvcpus". We can assign
virtual CPUs using it but my question is different. I am looking at
reserving cpu speed to the virtual cpu's. I know we can allocate and
modify the amount vcpu's using setvcpus command but how can i ask kvm to
reserve a particular amount of cpu speed of the host core's to the
virtual cpus.
Thanks
Jatin