Re: qemu goes to 100%?

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On Sat, 6 Apr 2019 12:27:01 -0400
Tom Horsley <horsley1953@xxxxxxxxx> wrote:

> Here's a weird one I just noticed: I've been using a
> Windows 10 virtual machine to run my tax software.
> I've got it displayed in virt-viewer and all is
> well, then I close the virt-viewer window and
> leave the KVM running. About 5 minutes later I
> see a cpu suddenly pegged at 100%. I run top and see
> that qemu is the culprit. I start virt-viewer
> again, and it goes back to normal.
> 
> Anyone else seen this? Why would nobody looking at
> it make it go crazy I wonder?

In addition to all the serious possibilities that everyone else already
mentioned, you may also want to take a look at the trivial reasons ---
maybe the Windows screensaver is configured to activate after 5 min of
user inactivity, and starts draining the CPU by drawing 3D intensive
stuff on the virtual display (you know --- pipes, swimming fish,
whatever). Naturally, it turns itself off as soon as it detects
keyboard/mouse activity, i.e. when you start the virt-viewer again, and 
you never even know it was there.

So you may want to take a look at all the screenlocking, screensaving,
power saving, etc... settings in Windows, and make sure all that stuff
(that doesn't make sense in a virtual machine environment), is turned
off and deactivated.

Just a thought. ;-)

Best, :-)
Marko

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