In recent days there have been updated Mesa 8.1 development benchmarks
put out looking at the R600
Gallium3D, R300 Gallium3D,
and Nouveau Gallium3D
open-source drivers. Those results for the different drivers show that Mesa 8.1
is generally faster than the current Mesa 8.0 stable series, but that does not
appear to be the case for Intel at the moment. It looks like there are some active
regressions that are lowering the Intel Ivy Bridge graphics performance with their
Mesa 8.1-devel driver.
In this article are some Intel HD 4000 "Ivy Bridge"
graphics benchmarks from an Intel Core i7 3770K processor. Testing happened on
the same setup as the other recent Mesa 8.1-devel benchmarking and with the same
software: Ubuntu 12.10 with the Unity 6.0 desktop, Linux 3.5 kernel, etc.
The Mesa 8.0.4 to Mesa 8.1-devel performance is being compared
in this very straightforward testing.