For about 3 weeks (give or take a week) a machine has been out of action due to this bug fixed as part of the kernel-smp-2.4.21-20.EL.i686.rpm package. The problem was kernel support for the Tyan s2885 motherboard’s AGP architecture. It manifested itself in terms of graphic hardware acceleration. Even though the proper graphics card drivers were installed (in this case NVIDIA), no acceleration was evident, glxinfo | grep “direct render” returned a value of “no”, glxgears reported 2000FPS (later we would get 8000) and Matlab benchmarks were pathetic.
Sticking with RHEL (distros with the 2.6 kernel couldn’t see 2 processors on the board) and upgrading the kernel did the trick for the X environment for the most part. The NVIDIA driver needed to be installed according to the manufacturer’s directions and passed the line Option “NvAGP” “3″ in the X config. Finally, even though glxgears demonstrated a marked improvement in 3D rendering speed, Matlab refused to speed up in the 3D category. It was only when I pointed the symbolic links libGL.so and libGLU.so in Matlab’s sys/opengl/lib/glnx86/ to their /usr/X11R6/lib64 counterparts that performance improved.