I couldn't reproduce this with a vm whose xml includes:
<memory>524288</memory>
<currentMemory>524288</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='pc-1.2'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/home/serge/machines/clean-precise-mini-amd64/disk0.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</disk>
I started the vm, ran 6 kernel compilations, did 'virsh save/virsh
restore', then did 6 more kernel compilations. All were in 272 or 273
seconds.
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https://bugs.launchpad.net/bugs/1100843
Title:
Live Migration Causes Performance Issues
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