[libvirt-users] Incorrect memory usage returned from virsh

[Connor Osborn]

Thanks for the clarification. I will probe more into dommemstat.

On Fri, Mar 18, 2016, 3:21 PM Eric Blake <eblake at redhat.com> wrote:

> On 03/18/2016 01:36 PM, Connor Osborn wrote:
> > When I run `virsh dominfo <domain>` I get the following:
> >
> > Id:             455
> > Name:           instance-000047e0
> > UUID:           50722aa0-d5c6-4a68-b4ef-9b27beba48aa
> > OS Type:        hvm
> > State:          running
> > CPU(s):         4
> > CPU time:       123160.4s
> > Max memory:     33554432 KiB
> > Used memory:    33554432 KiB
>
> That says that the host allows up to 32G memory to be consumed by the
> guest, and that no ballooning has taken place so the guest is free to
> use it all.  It doesn't mean that the guest is actually using it, though.
>
> > The domain is not at 100% memory capacity. How can I diagnose this
> further?
>
> You're asking the wrong interface.  dominfo only tells you how much of
> the memory balloon is in use (here, none), and does not ask how much
> memory the guest claims to be using.
>
> 'virsh memtune' and 'virsh dommemstat' ask different questions, and may
> be able to give you more insight into the guest's current memory usage
> (but it might also be something you can't learn without guest cooperation).
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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