Re: qemu goes to 100%?

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On 4/7/19 2:01 AM, Patrick O'Callaghan wrote:
On Sat, 2019-04-06 at 20:26 -0400, Sam Varshavchik wrote:
Tom Horsley writes:

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?

Because you're using Microsoft Windows 10. Its built-in spyware and
telemetry, that runs all the time and needs to report to Redmond, isn't cost-
free and is pretty hard on the CPU.

True, however QEMU-KVM also consumes significant CPU even when the
Windows guest is paused:

https://bugzilla.redhat.com/show_bug.cgi?id=1638289

poc

Whenever I have a problem with qemu-qvm, I install the latest
"upstream".  It is 95% of the time fixed.  if not, "upstream"
is extremely responsive to input.  Great bunch of guys!

https://fedoraproject.org/wiki/Virtualization_Preview_Repository


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