[Qemu-devel] git bisect results (was: Re: bad USB tablet update rate on qemu-1.0)

[Erik Rull]

Hi all,

I assume that I found a possible source of the bad usbtablet update rate.

I did some git bisectioning but I didn't get a usable result due to too 
many merges (or maybe my little knowledge to git), so I proceeded with some 
manual bisectioning by manually selecting commits and tested them.

The problem was that the usbtablet update-rate in qemu-kvm-1.0 was really 
bad compared to qemu-kvm-0.15.0.

The first commit where the cursor worked but the update rate was bad is
7cb78eec5cdf6e4131613c64cc1a29476f327242

Before this commit the usbtablet didn't work (no grabbing was possible).

But in 0.15.0 it worked. So I continued searching for interesting points 
between these versions.

One point was the SDL commit done 2011-08-05 by Jan Kiszka.
There I found changes that affected the -full-screen option.

So I took the version from the commit above and just started with the 
-full-screen option.
And everything was fine (qemu-kvm-1.0 as well)! The update rate is very 
good with this option.

But I was not able to find the real change that caused the bad update rate.

Jan - is it possible to track down with this information the cause of the 
bad update rate? It seems to be related to SDL - the VNC option is working 
fine without -full-screen.
I would like to work without the -full-screen option.

Thanks.

Best regards,

Erik