[Bug 1100843] Re: Live Migration Causes Performance Issues

[Stephen Gran]

We are reliably seeing this post live-migration on an openstack
platform.

Setup:
hypervisor ==> Ubuntu 12.04.3 LTS
libvirt ===> 1.0.2-0ubuntu11.13.04.2~cloud0
qemu-kvm ===> 1.0+noroms-0ubuntu14.10
storage: NFS exports
Guest VM OS: Ubuntu 12.04.1 LTS and CentOS 6.4

We have ept enabled.

Sample instance:

<domain type="kvm">
  <uuid>f3c16d27-2586-44c8-b9d9-84b74b42b5d3</uuid>
  <name>instance-00000508</name>
  <memory>4194304</memory>
  <vcpu>2</vcpu>
  <os>
    <type>hvm</type>
    <boot dev="hd"/>
  </os>
  <features>
    <acpi/>
  </features>
  <clock offset="utc">
    <timer name="pit" tickpolicy="delay"/>
    <timer name="rtc" tickpolicy="catchup"/>
  </clock>
  <cpu mode="host-model" match="exact"/>
  <devices>
    <disk type="file" device="disk">
      <driver name="qemu" type="qcow2" cache="none"/>
      <source file="/var/lib/nova/instances/instance-00000508/disk"/>
      <target bus="virtio" dev="vda"/>
    </disk>
    <interface type="bridge">
      <mac address="fa:16:3e:5d:0e:6a"/>
      <model type="virtio"/>
      <source bridge="qbrf43e9d83-56"/>
      <filterref filter="nova-instance-instance-00000508-fa163e5d0e6a">
        <parameter name="IP" value="10.253.138.156"/>
        <parameter name="DHCPSERVER" value="10.253.138.51"/>
      </filterref>
    </interface>
    <serial type="file">
      <source path="/var/lib/nova/instances/instance-00000508/console.log"/>
    </serial>
    <serial type="pty"/>
    <input type="tablet" bus="usb"/>
    <graphics type="vnc" autoport="yes" keymap="en-us" listen="0.0.0.0"/>
  </devices>
</domain>

We have a test environment and are willing to assist in debugging.
Please let us know what we can do to help.

Cheers,

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https://bugs.launchpad.net/bugs/1100843

Title:
  Live Migration Causes Performance Issues

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