Query with respect to VCPU scheduling

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Hello all,

I am new to KVM and look at a particular case in KVM.
I know that KVM uses CFS.

The question I have is as follows:

- I have two VMs with 2 VCPU each. And the actual
  CPUs are also 2 and both the VMs use the 2 CPUs.

I want one VM to use only 25 % of the actual CPU and the
remaining to be used by the other VM.

Since KVM uses CFS, I am thinking that with CFS I can
provide these guarantee as mentioned above.  I know
we can do these shares with cgroups.

Is cgroups the only option?. Any pointers to this would help.

Thanks,
Mohan
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