On Mon, Oct 07, 2002 at 09:43:30AM +1000, David Pastern wrote: > MTRR is to do with the CPU. Memory type something register (can't remember > the full name). I too mistakenly installed it into my kernel tree and get > that message coming up at every boot up. I'll get rid of it when I go to > the 2.4,20 kernel tree :<) mtrr = Memory Type Range Register. It's a way of setting certain parameters for different blocks of memory within your system. You can make some parts non-cachable, some parts to use write-combining, some parts to use write-back caching... According to /usr/src/linux/Documentation/mtrr.txt, using them can speed up AGP writes by a factor of 2.5. Everything Intel's made since the PPro supports them, and so do recent-ish Cyrix and AMD chips. Obviously, you can't use them if you don't have them, so kernels on older computers will cheerfully inform you that you can't use them. -rob
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