[Bug 716528] [NEW] kvm 100% when performing apparently IO operations

[Andres Rodriguez]

Public bug reported:

Binary package hint: qemu-kvm

Version: Natty
Kernel Version: 2.6.38-2-generic x86_64
KVM Version: QEMU emulator version 0.13.0 (qemu-kvm-devel)
LibVirt Version: libvirtd (libvirt) 0.8.5

I created a VM using virt-manager. During the installation, the process
kvm has a CPU usage goes of 100%.

Being aware of the virt-manager [1], bug #707313, (using 100% CPU), I
used top to determine weather this was virt-manager of kvm itself. After
doing so, I noticed that both, kvm and python processes where more than
80% of usage. So I decided to go ahead and close virt-manager and the
VNC window for the current VM. Then, I returned to a terminal to see
top's output, and it showed now that the kvm process was the only one
with 100% CPU usage.

Note that the CPU usage is only at 100% when doing IO, apparently.

A video showing this behavior can be found at [2].

[1]: https://bugs.launchpad.net/ubuntu/+source/virt-manager/+bug/707313
[2]: me.roaksoax.com/kvm.ogv

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/716528

Title:
  kvm 100% when performing apparently IO operations