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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> centos-virt-bounces@centos.org <centos-virt-bounces@centos.org> on behalf of Laurentiu Soica <laurentiu@soica.ro><br>
<b>Sent:</b> Sunday, August 14, 2016 10:17 AM<br>
<b>To:</b> Discussion about the virtualization on CentOS<br>
<b>Subject:</b> Re: [CentOS-virt] Nested KVM issue</font>
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<div dir="ltr">More details on the subject:
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<div>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.</div>
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<div>I am using CentOS 7 with:</div>
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<div>kernel: 3.10.0-327.22.2.el7.x86_64</div>
<div>qemu-kvm:1.5.3-105.el7_2.4</div>
<div>libvirt:1.2.17-13.el7_2.5</div>
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<div>on both the baremetal and the compute VM.<br>
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<b>Please, post</b><br>
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1) # virsh dumpxml VM-L1 ( where on L1 level you expect nested KVM to appear)<br>
2) Login into VM-L1 and run :-<br>
# lsmod | grep kvm<br>
3) I need outputs from VM-L1 ( in case it is Compute Node )<br>
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# cat /etc/nova/nova.conf | grep virt_type<br>
# <span>cat /etc/nova/nova.conf | grep cpu_mode</span><br>
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Boris.<br>
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<div>The only workaround now is to shutdown the compute VM and start it back from baremetal with virsh start.</div>
<div>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.</div>
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<div>Laurentiu</div>
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<div dir="ltr">Īn dum., 14 aug. 2016 la 00:19, Laurentiu Soica <<a href="mailto:laurentiu@soica.ro">laurentiu@soica.ro</a>> a scris:<br>
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<div dir="ltr">Hello,
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<div>I have an OpenStack setup in virtual environment on CentOS 7.</div>
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<div>The baremetal has <b>nested KVM</b> enabled and 1 compute node as a VM.</div>
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<div>Inside the compute node I have multiple VMs running.</div>
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<div>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.</div>
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<div>Please help me with some hints to debug this issue.</div>
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<div>Thanks,</div>
<div>Laurentiu</div>
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