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

Andres Rodriguez andreserl at ubuntu-pe.org
Thu Feb 10 17:28:02 UTC 2011


testdrive kvm command:

kvm -m 512 -smp 2 -cdrom /home/roaksoax/.cache/testdrive/iso
/ubuntu_natty-server-i386.iso -drive
file=/home/roaksoax/.cache/testdrive/img/testdrive-disk-
J_PcC_.img,if=virtio,cache=writeback,index=0,boot=on -usb -usbdevice
tablet -net nic,model=virtio -net user -soundhw es1370 -vga cirrus

** Description changed:

  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.
+ Note that the CPU usage is only at 100% when doing intensive 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

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

Title:
  kvm 100% when performing apparently IO operations



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