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

[tobias]

Did some testing: if one pauses the vms that run windows before suspending 
ubuntu no high cpu usage is there once the host and windows vms are resumed.
 for me it's workable then in ubuntu by using a suspend / resume script with 
power manaager. I put this in /etc/pm/sleep.d (and make it executable) :

#!/bin/bash
PS_VM=/var/run/paused_vms

is_there_virsh () {
if [[ -z `which virsh` ]]
then echo "no actions for suspend or resume required"
exit 0
fi
}
case "$1" in
    suspend)
        is_there_virsh
        echo "" > /var/run/paused_vms
        for i in $(virsh list --state-running | grep running | awk {'print $2'})
        do echo $i >> /var/run/paused_vms
           virsh suspend $i
        done
        ;;
    resume)
        is_there_virsh
        for i in $(cat $PS_VM)
        do virsh resume $i
        done
        # optionally remove the file but this seems not required?
        rm $PS_VM
        ;;
    *)
        ;;
esac

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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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