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[Xen-users] qemu-dm dom0 high CPU usage when usbdevice=tablet

  • To: xen-users@xxxxxxxxxxxxx
  • From: Christian Fassina Costa <atros@xxxxxxxxx>
  • Date: Wed, 30 Jul 2014 11:34:30 +1200
  • Delivery-date: Tue, 29 Jul 2014 23:35:55 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

Hey guys,

It seems like the qemu-dm processes on the dom0 use quite a lot of CPU when usbdevice=tablet is used for a Windows a guest.

Setting that to 'none' fixes the problem, however, the mouse pointer doesn't track correctly when connecting to VNC. This is what I found out from looking at other reports of this problem.

A hypervisor running Xen 4.0.1 with aÂ2.6.32-5-xen-amd64 doesn't seem to exhibit the same high CPU usage.

I've also tried it on different set ups:

- Xen 4.1.5 andÂ3.2.0-61-generic
- Xen andÂ3.2.0-51-generic

Just wondering if anyone would have a solution for this issue. I did some research and it looks like quite a few people have come across this problem.Â

I'm also not sure if this is the right place to be asking that, however, since I couldn't find any bug reports so I'm wondering if perhaps there is a solution to the high CPU usage or the mouse tracking over VNC.

Any help or pointers as to how this could be solved would be appreciated.

Kind regards,


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