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[Qemu-discuss] openstack with kvm CPU usage issue

From: Laurentiu Soica
Subject: [Qemu-discuss] openstack with kvm CPU usage issue
Date: Wed, 17 Aug 2016 16:46:04 +0000


I have an openstack setup with KVM as hipervisor in virtual environment.

- a baremetal with 2 physical CPUs: 128 GB RAM
- the compute node, that is a VM under KVM on the baremetal, with 100
GB RAM and 36 vCPUs
- 15 VMs running inside the compute node, under KVM aswell.

The baremetal and compute are both running CentOS 7 and on the
baremetal I've enabled nested KVM feature.
Kernel is 3.10.0-327.22.2.el7.x86_64
qemu-kvm is 1.5.3-105.el7_2.7

The issue is that after a few days of running, the compute node's
qemu-kvm process (on the baremetal) goes into full CPU usage (3600%)
and the VMs under it are no longer accessible.
The swap is disabled on the compute and there is no swap activity on
baremetal as well (aroung 100 MB used).

When the compute goes into full CPU usage the baremetal has around
60GB of RAM still free and the compute around 70 GB of RAM free.

If something rings a bell or do you have some troubleshooting tips,
please let me know.


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