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Maxing only Single core on instance with multiple vcpus

asked 2020-05-18 10:13:17 -0600

anonymous user


Hi all,

Just recently deployed Openstack Queens onto an Ubuntu 18.04 LTS Server. Followed the guide doc(s) on the Openstack website.

Note that this is an all-in-one build.

After running htop to see the systems overall usage, I can see that there is really only one core of my 4-Core ( 8 Threads ) processor is completely maxed at 100% while running instance(s) with all other cores remaining underutilized.

I tested this with running instances with 2, and then 4 vCPUs - Which shows a similar result in CPU usage.

I tried increasing the property cpu_allocation_ratio in nova.conf, but nothing changed.

Any ideas on what the issue might be? Could this be an openstack issue or something else that I need to rectify.

Thanks in advance.

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answered 2020-05-19 09:37:52 -0600

MrMr gravatar image

Hi all,

Answering my own question here after some tinkering.

Under the [libvirt] category in nova.conf, I changed virt_type=qemu to virt_type=kvm. This fixed my issue, others can chime in if they feel its not the best for the long run.

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Asked: 2020-05-18 10:11:58 -0600

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Last updated: May 18 '20