Mouse motion lags

Mouse motion lags

[Volodymyr Buell]

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

Thanks,
Volodymyr

Re: Mouse motion lags

[Todd Deshane]

On Thu, Jan 1, 2009 at 12:05 PM, Volodymyr Buell <vbuell@gmail.com> 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
>

Try adding -usb -usbdevice tablet

Hope that helps.

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

Re: Mouse motion lags

[Volodymyr Buell]

On Thu, Jan 1, 2009 at 11:44 PM, Todd Deshane <deshantm@gmail.com> wrote:
> On Thu, Jan 1, 2009 at 12:05 PM, Volodymyr Buell <vbuell@gmail.com> 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
>>
>
> Try adding -usb -usbdevice tablet
>
> Hope that helps.

Unfortunately it brings yet more laggy result. It looks like mouse
filtering in first person action games but again with the delay I
mentioned before it's nearly unusable...

-- 
Thanks,
Volodymyr

Re: Mouse motion lags

[Jindrich Makovicka]

[-- Attachment #1: Type: text/plain, Size: 1351 bytes --]

On Fri, 2 Jan 2009 00:08:27 +0200
"Volodymyr Buell" <vbuell@gmail.com> wrote:

> On Thu, Jan 1, 2009 at 11:44 PM, Todd Deshane <deshantm@gmail.com>
> wrote:
> > On Thu, Jan 1, 2009 at 12:05 PM, Volodymyr Buell <vbuell@gmail.com>
> > 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
> >>
> >
> > Try adding -usb -usbdevice tablet
> >
> > Hope that helps.
> 
> Unfortunately it brings yet more laggy result. It looks like mouse
> filtering in first person action games but again with the delay I
> mentioned before it's nearly unusable...

You can try the attached patch - it shortens the screen update interval
when the mouse moves. It's just a proof of concept and a little bit
ugly, but should work.

I once tried to submit something similar to QEMU upstream, when the
screen update interval was still hardcoded, but the patch wasn't
accepted. There could be some chance now when the update interval is
already dynamic so the modification is trivial.

-- 
Jindrich Makovicka

[-- Attachment #2: sdl.c.diff --]
[-- Type: text/x-patch, Size: 919 bytes --]

--- sdl.c.orig	2008-12-24 15:24:58.000000000 +0100
+++ sdl.c	2009-01-06 23:53:26.282639309 +0100
@@ -356,6 +356,7 @@
     SDL_Event ev1, *ev = &ev1;
     int mod_state;
     int buttonstate = SDL_GetMouseState(NULL, NULL);
+    int moved = 0;
 
     if (last_vm_running != vm_running) {
         last_vm_running = vm_running;
@@ -484,6 +485,7 @@
                 absolute_enabled) {
                 sdl_send_mouse_event(ev->motion.xrel, ev->motion.yrel, 0,
                        ev->motion.x, ev->motion.y, ev->motion.state);
+		moved = 1;
             }
             break;
         case SDL_MOUSEBUTTONDOWN:
@@ -536,6 +538,10 @@
             break;
         }
     }
+    if (moved && ds->gui_timer_interval == 0)
+	ds->gui_timer_interval = 10;
+    else if (!moved && ds->gui_timer_interval == 10)
+	ds->gui_timer_interval = 0;
 }
 
 static void sdl_fill(DisplayState *ds, int x, int y, int w, int h, uint32_t c)

Re: Mouse motion lags

[Avi Kivity]

Volodymyr Buell 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?

-- 
error compiling committee.c: too many arguments to function

Re: Mouse motion lags

[nuitari]

>>  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.

Re: Mouse motion lags

[Avi Kivity]

nuitari@melchior.nuitari.net wrote:
> 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.

What sort of guest load?

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

Re: Mouse motion lags

[Antoine Martin]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

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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Re: Mouse motion lags

[Jamie Kirkpatrick]

Try adding -usbdevice tablet.  This should sort it out.

2009/1/6 Antoine Martin <antoine@nagafix.co.uk>:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> 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
>
>
>
>
>
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>
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> T+IAniL0CNXWJbrF1Okfm9It8Sj2RC9W
> =9yrd
> -----END PGP SIGNATURE-----
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>



-- 
Jamie Kirkpatrick
07818 422311

Re: Mouse motion lags

[Antoine Martin]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Jamie Kirkpatrick wrote:
> Try adding -usbdevice tablet.  This should sort it out.

Thank you very much. That did the trick!


> 
> 2009/1/6 Antoine Martin <antoine@nagafix.co.uk>:
> 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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>>

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Re: Mouse motion lags

[Ian Kirk]

Antoine Martin wrote:

> 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.

If the guest is Windows, turn off "Enhance pointer precision" under
Control Panel->Mouse->Pointer Options. I found this to make the pointers
move at the same rate.