https://bugs.freedesktop.org/show_bug.cgi?id=26892
--- Comment #8 from Ancoron <[email protected]> 2010-04-20 15:09:23 PDT --- I'm also suffering from the massive performance degradation switching from UMS to KMS. I just switched from KMS back to UMS using a Radeon X1550 with a single 1680x1050 head because the desktop effects are unbearably slow on that system (and the setup is fine according to all logs). I miss the high resolution VTs and the nice plymouth boot splash, but in the end I have to get some work done, that's why I switched to Linux years ago. And on another machine (Radeon HD4770) I too have this issue. I thought that graphics card would be fast enough to display the KDE4 desktop cube animation smooth enough but it feels like being somewhat around 15-20FPS and with UMS it was as smooth as it can get I think even under high workloads. With KMS however the CPU workload influences the graphical performance of the system much more than it does with UMS. Although this is a very subjective thing I'm sure it would be measurable. Both machines I currently use show this issue with kernels 2.6.32+drm33 (ubuntu lucid), 2.6.33 and 2.6.34-rc4. So this is a basic issue for KMS, regardless of the actual GPU chip. As I regularly look at the performance measurements over at phoronix I see that KMS focusses on the more complex work, rather than making the simple things faster (that's an explanation why glxgears on my HD4770 runs about 500% faster with UMS). -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ xorg-driver-ati mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-driver-ati
