[Intel-gfx] Howto enable i830FALLBACK, regressions with xorg/intel from git.

[Clemens Eisserer]

Hello,

I've compiled xorg-git to be able to test the latest intel driver
(from git://git.freedesktop.org/git/xorg/driver/xf86-video-intel )
without performance limitations in xserver-1.5.1, however performance
seems to have degraded compared to xserver-1.3/intel-2.1.1.
Accoding to the log  EXA is enabled, but it seems a lot more software
rendering is happening, for example this is the oprofile output for
identical workload:

Compiled from GIT:
94037    32.5533  libpixman-1.so.0.13.1    libpixman-1.so.0.13.1
fbFetchTransformed_Nearest_Normal
42065    14.5619  libpixman-1.so.0.13.1    libpixman-1.so.0.13.1    fbFetch_a8
24445     8.4623  libpixman-1.so.0.13.1    libpixman-1.so.0.13.1    fbStore_a8

Xserver-1.3/intel-2.1.1
82108    17.2158  no-vmlinux               no-vmlinux               (no symbols)
66792    14.0045  anon (tgid:2906 range:0xb5ef8000-0xb6198000) java
                 (no symbols)
34200     7.1708  libexa.so                libexa.so
exaGetPixmapOffset
24052     5.0430  intel_drv.so             intel_drv.so             (no symbols)

I guess something is wrong with my setup, I wonder where all these
software fallbacks come from.
I tried to enable all those I830FALLBACK directly in source, but I
don't know where to look for the output.
How do I enable it correctly, and where do I have to look for the output?

The Xorg.0.log can be found here: http://pastebin.com/m753a2ff1
Any idea whats wrong?

By the way -aa10text performance is great, i get about 950.000 chars/s :)

Thanks, Clemens