Re: [Qemu-devel] Disable PS/2 mouse

[Peter Lieven <pl@dlh.net>]

Gerd Hoffmann wrote:
> On 06/10/2010 09:12 AM, Dor Laor wrote:
>> On 06/09/2010 05:35 PM, Gerd Hoffmann wrote:
>>> Hi,
>>>
>>>> with 0.12.4 it is still the case that a total idle vm takes about 6-8%
>>>> of a 2.4GHz Xeon Core.
>>>
>>> I see that order of magitude too, no matter whenever usb is on or off.
>>> With older qemu and usbtablet it used to be up to 25%.
>>
>> Is it possible to dynamically control the refresh internally within qemu
>> so VMs without a connected VNC client will have rare refreshes or no
>> refresh at all? I hope it's not the OS who polls it.
>
> vnc/vga or usb tablet?
>
> For the vga it happens already, with no vnc client connected vnc zaps 
> the refresh timer and stops calling vga_hw_update(), thus vga stops 
> doing framebuffer dirty tracking too.
>
> For usb hid devices:  No idea how they work and whenever we can put 
> them into sleep somehow (with/without guest cooperation).
is it the emulated bus or the tablet device that is generating the load?


>
> cheers,
>   Gerd
>
>