Re: Mouse motion lags

Antoine Martin
2009-01-06T06:37:20Z

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nuitari@melchior.nuitari.net wrote:
>>> Hi everybody,
>>>
>>> I switched to KVM some time ago from vmware and VB. Everything works
>>> great but there are noticeable lags in mouse motion in comparison with
>>> other VMs.
>>> Is this a known issue? Are there any optimizations for that?
>>>
>>> KVM: 79
>>> Distr: Ubuntu Intrepid & Jaunty
>>> Command line: QEMU_AUDIO_DRV=sdl; kvm -net nic -net user -soundhw
>>> es1370 -m 750 -smp 2 win.qcow
>>>
>>
>> Is this under guest or host load? Or just moving the mouse around?
>>
>> Is the host swapping by any chance?
>
> I've noticed that issue on guest load, no swapping.
> But even just moving the mouse around feels more laggy then under vmware.
> I've tried mine with just 1 guest cpu.

I've noticed what I believe to be the same bug: when moving the mouse
around the vnc viewer, the guest does not seem to follow the same
acceleration and I end up with 2 pointers completely out of sync.

This makes it really hard to use the mouse (especially as the real
pointer often moves off-screen before you reach the part of the guest
screen that you need..)
I normally would not care about mouse and UI (I run most guests in
no-graphic mode), but I have to run some tests against "that-other-OS"
at the moment, and this makes it even more of a nightmare.

Any advice would be much appreciated.
I have tried various VNC clients (no effect), looked for mouse options,
etc..

Thanks
Antoine

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