________________________________ From: centos-virt-bounces@centos.org centos-virt-bounces@centos.org on behalf of Laurentiu Soica laurentiu@soica.ro Sent: Sunday, August 14, 2016 10:17 AM To: Discussion about the virtualization on CentOS Subject: Re: [CentOS-virt] Nested KVM issue
More details on the subject:
I suppose it is a nested KVM issue because it raised after I enabled the nested KVM feature. Without it, anyway, the second level VMs are unusable in terms of performance.
I am using CentOS 7 with:
kernel: 3.10.0-327.22.2.el7.x86_64 qemu-kvm:1.5.3-105.el7_2.4 libvirt:1.2.17-13.el7_2.5
on both the baremetal and the compute VM.
Please, post
1) # virsh dumpxml VM-L1 ( where on L1 level you expect nested KVM to appear) 2) Login into VM-L1 and run :- # lsmod | grep kvm 3) I need outputs from VM-L1 ( in case it is Compute Node )
# cat /etc/nova/nova.conf | grep virt_type # cat /etc/nova/nova.conf | grep cpu_mode
Boris.
The only workaround now is to shutdown the compute VM and start it back from baremetal with virsh start. A simple restart of the compute node doesn't help. It looks like the qemu-kvm process corresponding to the compute VM is the problem.
Laurentiu
În dum., 14 aug. 2016 la 00:19, Laurentiu Soica <laurentiu@soica.romailto:laurentiu@soica.ro> a scris: Hello,
I have an OpenStack setup in virtual environment on CentOS 7.
The baremetal has nested KVM enabled and 1 compute node as a VM.
Inside the compute node I have multiple VMs running.
After about every 3 days the VMs get inaccessible and the compute node reports high CPU usage. The qemu-kvm process for each VM inside the compute node reports full CPU usage.
Please help me with some hints to debug this issue.
Thanks, Laurentiu