[libvirt-users] Incorrect memory usage returned from virsh
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 Persistent: yes Autostart: disable Managed save: no Security model: apparmor Security DOI: 0 Security label: libvirt-50722aa0-d5c6-4a68-b4ef-9b27beba48aa (enforcing) The domain is not at 100% memory capacity. How can I diagnose this further?
"virsh dommemstat <domain>" may help you. On 03/18/2016 09:36 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 Persistent: yes Autostart: disable Managed save: no Security model: apparmor Security DOI: 0 Security label: libvirt-50722aa0-d5c6-4a68-b4ef-9b27beba48aa (enforcing)
The domain is not at 100% memory capacity. How can I diagnose this further?
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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
Thanks for the clarification. I will probe more into dommemstat. On Fri, Mar 18, 2016, 3:21 PM Eric Blake <eblake@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
participants (3)
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Connor Osborn -
Eric Blake -
Fırat KÜÇÜK