is it possible not to use "-usbdevice tablet"?

[mangoo]

Is it possible not to use "-usbdevice tablet" for selected guests?

It is generating lots of interrupts, affecting responsiveness, but is normally not needed for console only Linux guests. This is especially visible with more guests running on a host.

Reference:

http://marc.info/?t=124332682700001&r=1&w=4
http://marc.info/?t=124333103200001&r=1&w=4

 

[dietmar]

We need it for the vnc mouse (else mouse runs out of sync). Or is there a better way to solve that problem (vinagre is not an option)?

Anyway, I would accept a patch to qemu-server to disable it (for server applications). something like:

tablet: (yes/no)

or

usb: (yes/no)

not sure whats better.

- Dietmar

 

[mangoo]

We need it for the vnc mouse (else mouse runs out of sync). Or is there a better way to solve that problem (vinagre is not an option)?

Anyway, I would accept a patch to qemu-server to disable it (for server applications). something like:

tablet: (yes/no)

or

usb: (yes/no)

not sure whats better.

- Dietmar

Still, I can imagine one may want to use USB even if not using "-usbdevice tablet".

So here is my patch for "tablet:" option.

With it, in config file, you can specify:

tablet: 0

which will make the guest start without "-usbdevice tablet" option.

Specifying "tablet: 1" or not specifying it at all in the config file defaults to adding "-usbdevice tablet" (current behaviour).

--- QemuServer.pm.orig  2009-05-12 09:23:20.000000000 +0200
+++ QemuServer.pm       2009-05-27 11:23:21.000000000 +0200
@@ -127,6 +127,7 @@
     parallel => 'parallel',
     startdate => 'startdate',
     args => 'string',
+    tablet => 'bool',

     #cpu => 'string',
     #machine => 'string',
@@ -179,6 +180,7 @@
     memory => ['natural', 512],
     vga => ['vgatype', 'cirrus'],
     tdf => ['bool', 1],
+    tablet => ['bool', 1],
 };

 my $kvm_api_version = 0;
@@ -1222,7 +1224,8 @@
     push @$cmd, '-incoming', "exec:cat $statefile" if $statefile && -f $statefile;

     # enable absolute mouse coordinates (needed by vnc)
-    push @$cmd, '-usbdevice', 'tablet';
+    my $tablet = defined ($conf->{tablet}) ? $conf->{tablet} : $defaults->{tablet};
+    push @$cmd, '-usbdevice', 'tablet' if $tablet;

     # host usb devices
     if (my $usbdl = $conf->{hostusb}) {

 

[dietmar]

Thanks, but please can you also update the manual page (edit the file 'qm') - it is good to have some documentation ;-)

 

[dietmar]

And please send patches directly to me dietmar@proxmox.com - many thanks for your help!

- Dietmar

 

[mangoo]

And please send patches directly to me dietmar@proxmox.com - many thanks for your help!

- Dietmar

OK, sent.

 

[escoreal]

We need it for the vnc mouse (else mouse runs out of sync). Or is there a better way to solve that problem (vinagre is not an option)?

Hi,

for windows guest we disable "Enhance Pointer Precision" Option in "Pointer Options" (Control Panel -> Mouse). The mouse speed has to be at default.

Registry Entries:
HKCU\Control Panel\Mouse
"MouseSpeed"="0"
"MouseThreshold1"="0"
"MouseThreshold2"="0"

For Linux guest we only have console.

So we can save the idle cpu usage and the mouse pointer works too.

esco