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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20160813/77cb3df8/attachment-0002.html>
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. 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 ?n dum., 14 aug. 2016 la 00:19, Laurentiu Soica <laurentiu at 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 >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20160814/6cf64c21/attachment-0002.html>
________________________________
From: centos-virt-bounces at centos.org <centos-virt-bounces at
centos.org> on behalf of Laurentiu Soica <laurentiu at 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
?n dum., 14 aug. 2016 la 00:19, Laurentiu Soica <laurentiu at
soica.ro<mailto:laurentiu at 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
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