[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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