[Qemu-devel] [Bug 1174654] Re: qemu-system-x86_64 takes 100% CPU after host machine resumed from suspend to ram

[Jürgen Veidt]

I observed a similar behavior with a different application on a Windows host. 
The application is using the multimedia timer. In my case it seems that the 
timer is catching up the ticks missed during suspend to ram after resume. The 
timer thread performing the callbacks has high-priority on Windows and makes 
the host machine almost unusable for a certain time depending on the suspend 
duration. 
Maybe it is a similar situation here?

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https://bugs.launchpad.net/bugs/1174654

Title:
  qemu-system-x86_64 takes 100% CPU after host machine resumed from
  suspend to ram

Status in QEMU:
  Confirmed
Status in qemu package in Ubuntu:
  Invalid

Bug description:
  I have Windows XP SP3  inside qemu VM. All works fine in 12.10. But
  after upgraiding to 13.04 i have to restart the VM each time i
  resuming my host machine, because qemu process starts to take CPU
  cycles and OS inside VM is very slow and sluggish. However it's still
  controllable and could be shutdown by itself.

  According to the taskmgr any active process takes 99% CPU. It's not
  stuck on some single process.

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