Windows 8 Beats Ubuntu Linux For Intel "Haswell" OpenGL Performance
For the GpuTest GL3 workloads, the GiMark and TessMark tests wouldn't even run on the Intel Linux driver while they worked fine with Windows 8.
The other GpuTest workloads ranged from Windows 8 being over 30% faster to just being marginally faster than Ubuntu 13.10 Linux.
With the Pixmark Volplosion test was the only other case besides OpenArena where the Intel Linux stack was able to secure a performance victory.