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

[tobias <tobias@appelo.org>]

Hi,

ok confusion cleared :-)
actually i only have this issue with windows guests. linux guests do not 
show a high cpu usage after suspend resume.
so are there any recommendations you would have to work around it ?

regards,

Tobias.


On 18-10-13 09:42, mike wrote:
> On 10/18/2013 03:41 PM, tobias appelo wrote:
>> Hello MIke,
>>
>> but this concerns a windows guest. you mean a kernel configuration 
>> within the guest (aka recompile ?) or a boot parameter within the 
>> guest ?
>>
> Oh, sorry, I assume it is linux guest :)
>
> for windows, I have no idea of it :)
>
> Thanks
> Mike
>> regards,
>>
>> Tobias.
>>
>> On 18-10-13 09:26, mike wrote:
>>> On 10/18/2013 03:12 PM, tobias wrote:
>>>> Hello Mike,
>>>>
>>>> Thanks a lot for getting back on this.
>>>> Is the "cpu idle driver" a command line option I need to specify for
>>>> qemu (the -cpu option ?)
>>>> I could not find a reference to "idle" in the man page.
>>> You need to check the guest kernel config file.
>>>
>>> Thanks
>>> Mike
>>>> regards,
>>>>
>>>> Tobias.
>>>>
>>>> On 18-10-13 04:33, mike wrote:
>>>>> On 10/18/2013 04:29 AM, tobias wrote:
>>>>>> hi,
>>>>>>
>>>>>> tried your option but it does not help. (cpu usage is still high)
>>>>>> below my command line syntax:
>>>>>> qemu-system-x86_64 -global mc146818rtc.lost_tick_policy=slew 
>>>>>> -machine
>>>>>> accel=kvm:tcg -name win7 -S -machine pc-i440fx-1.4,accel=kvm,usb=off
>>>>>> -m 2048 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid
>>>>>> 813f5806-64ec-3319-452a-5e1834e753c9 -no-user-config -nodefaults
>>>>>> -chardev
>>>>>> socket,id=charmonitor,path=/var/lib/libvirt/qemu/win7.monitor,server,nowait 
>>>>>>
>>>>>> -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime
>>>>>> -no-shutdown -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7
>>>>>> -device
>>>>>> ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 
>>>>>>
>>>>>> -device
>>>>>> ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1
>>>>>> -device
>>>>>> ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2
>>>>>> -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x8 
>>>>>> -drive
>>>>>> file=/data/vmware/win7.img,if=none,id=drive-virtio-disk0,format=qcow2 
>>>>>>
>>>>>> -device
>>>>>> virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 
>>>>>>
>>>>>> -device usb-tablet,id=input0 -device
>>>>>> intel-hda,id=sound0,bus=pci.0,addr=0x4 -device
>>>>>> hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device
>>>>>> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -vga std
>>>>> Hi, have you enable the kernel CPU idle driver? especially the guest
>>>>> kernel.
>>>>>
>>>>> Thanks
>>>>> Mike
>>>>>
>>>
>>
>

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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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