Re: [Qemu-devel] bad USB tablet update rate on qemu-1.0

[Erik Rull <erik.rull@rdsoftware.de>]

Andreas Färber wrote:
> Am 19.01.2012 17:40, schrieb Erik Rull:
>> Erik Rull wrote:
>>> Erik Rull wrote:
>>>> Erik Rull wrote:
>>>>> Anthony Liguori wrote:
>>>>>> On 12/19/2011 03:33 PM, Erik Rull wrote:
>>>>>>> Hi all,
>>>>>>>
>>>>>>> coming from qemu 0.14 the usbdevice tablet update rate gets really
>>>>>>> bad in
>>>>>>> qemu-1.0 with the same guest.
>>>>>>
>>>>>> What's the specific guest?
>>>>>>
>>>>>> Regards,
>>>>>>
>>>>>> Anthony Liguori
>>>>>>
>>>>>
>>>>> It's a Windows XP guest. It was fine in 0.14
>>>>>
>>>>> Thanks.
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Erik
>>>>>
>>>>
>>>> Any progress here? I tested it on another CPU board there it was worse -
>>>> only 1-2 cursor updates per second :-(
>>>> I tried to use the wacom-tablet but didn't find a driver that works.
>>>>
>>>> Best regards,
>>>>
>>>> Erik
>>>>
>>>
>>> Hi all,
>>>
>>> today I tested some stuff with VNC for remote access of the VM - there
>>> the
>>> update rate of the USB tablet (mouse cursor) was really great. So the
>>> question is now:
>>> - Same host operating system for 0.14 and 1.0
>>> - Same command line parameters beside the vnc option
>>> Why is the native mouse on the qemu 0.14 system good for both vnc and
>>> native and on the qemu 1.0 system only good for vnc and bad for the
>>> native
>>> hardware mouse?
>>>
>>> Maybe this helps finding the source of evil...
>>> If you have ideas what to change / patches to test, just let me know.
>>>
>>> Best regards,
>>>
>>> Erik
>>>
>>
>> Hi all,
>>
>> I additionally tested -std vga to exclude that it might be related to
>> the cirrus emulation - but same result. So there seems to be a
>> difference between the captured cursor for the native X-Windows window
>> and the VNC window that occured somewhere between 0.14 and 1.0.
>
> Then try `git bisect start v1.0 v0.14.0' to find out when exactly the
> perceived behavior changed. :)
>
> Andreas
>

Hi Andreas,

thanks for the hint, I haven't used git up to now. Very interesting feature.
I just did a clone of the current qemu-kvm (which I use) and started to 
bisect, but got an error, where I don't know how to proceed:
erik@debian:~/qemu-test/qemu-kvm$ git bisect good qemu-kvm-0.14.0
You need to start by "git bisect start"
Do you want me to do it for you [Y/n]?
erik@debian:~/qemu-test/qemu-kvm$ git bisect bad qemu-kvm-1.0
Bisecting: 2043 revisions left to test after this
fatal: Entry 'roms/seabios' not uptodate. Cannot merge.
erik@debian:~/qemu-test/qemu-kvm$

Any ideas?
I did a git pull, but I just got the response that it is already up to date...

Best regards,

Erik