For some reason radeon_dri.so is missing from the mesa-dri-drivers-9.2.5-5.20131218.el7.x86_64 RPM. On a system with a chipset supported by radeon_dri.so it fails to load (of course) causing X to revert to swrast. The result is X that is so slow and painful, it makes me wish for a Windows box. ;-) This doesn't affect purely OpenGL applications, but 2D desktops that use AIGLX to accelerate 2D as well.<br />
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Please no mocking me for wanting functional X on a server.<br />
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Snippet from Xorg.0.log:<br />
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[ 87074.717] (EE) AIGLX error: dlopen of /usr/lib64/dri/radeon_dri.so failed (/usr/lib64/dri/radeon_dri.so: cannot open shared object file: No such file or directory)<br />
[ 87074.717] (EE) AIGLX: reverting to software rendering<br />
[ 87074.722] (II) AIGLX: Loaded and initialized swrast<br />
[ 87074.722] (II) GLX: Initialized DRISWRAST GL provider for screen 0
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