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Re: Limiting per vCPU Usage
From: |
Daniel P . Berrangé |
Subject: |
Re: Limiting per vCPU Usage |
Date: |
Mon, 21 Sep 2020 09:29:50 +0100 |
User-agent: |
Mutt/1.14.6 (2020-07-11) |
On Sun, Sep 20, 2020 at 10:24:41PM +0200, Peter Lieven wrote:
> Hi Qemu folks,
>
>
> is there a BCP to limit just the maximum usage of a virtual (KVM) cpu?
>
> I know that there are many approaches, but as far as I know they all limit
> the complete qemu process which is far more
>
> than just the virtual CPUs.
>
> Is it possible to limit just the vCPU threads and leave threads that
> handle the monitor, vnc, qmp, iothreads, storage backend etc.
Libvirt uses cgroups to achieve what you describe. A cgroup for the
QEMU process as a whole, then create child cgroups, one for each
vCPUs, and a further one for non-vCPU threads. CPU limits are then
applied on the child cgroups.
Regards,
Daniel
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