On Wed, 2006-04-26 at 10:32 +0200, Lukas Hejtmanek wrote: > On Tue, Apr 25, 2006 at 09:37:08AM -0700, Ian Romanick wrote: > > That's not the least bit surprising to me. The i915 shares memory > > bandwidth with the processor, and the 7500 has it's own dedicated memory > > bus. The i915 also lacks may of the bandwidth reduction strategies that > > have been included in other graphics chips for 8 years or more. It's > > really not a high performing chip for 3D. > > Well, I tried ppracer (the same version) in Windows XP. I got there 55FPS with > the same setting. (which is quite better compared to Linux 11FPS).
The open source driver isn't doing some important things that can be done to improve memory bandwidth usage. 5x is more than I expected, but it's not unbelievable. If you had a clear performance regression between versions of the open-source driver, we should definitely track that down, though.
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