It's very like KMS vs. UMS. Quake3(live) on a X1500 radeon is unplayable with KMS. With UMS i get 125FPS pretty much all the time....
If you boot with radeon.modeset=0 you can disable it, X/mesa should still work.
Would be nice if phoronix actually did a comparison between KMS/UMS, or just did a simple check if mandriva/pclinux has disabled KMS....).




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