Hi, I'm using a Radeon 7500 (RV200 QW) on an Athlon XP1700+, but glxgears does only reach about 370-440 fps, which is (AFAIR on IRC) way below the expected performance for that machine. I tested both 4.3.0 (Debian pre1v1) and latest binary DRI on top, but it didn't change much. I tested both the DRM from 2.6.0-test3 and the DRM that is shipped with 4.3.0 on top of 2.4.21-bk30. glxgears tells me that direct rendering is enabled and indeed the performance drops severely if I use it without DRM (down to 60 fps). I tried to disable/enable all possible combinations of driver tweaks (like RADEON_NO_IRQS etc.), but that didn't help. You can find my X.log, my Xfree-config, glxinfo output and lspci -vvv at http://www.tzi.de/~jmm/radeon-7500-dri-slowness.tar.gz
The only thing that looks at all odd in any of that is:
(WW) System lacks support for changing MTRRs.
Does your kernel have MTRR support? If not, try rebuilding with that enabled. That should give you a healthy speed boost.
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