[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow

[sabby]

I add the same problem as George Lesica, except the memory address where
different.  Everything seem to work fine for me, but the error in dmesg
was still bugging me.  Note that I didn't see this

mtrr: type mismatch for e0000000,10000000 old: write-back new: write-
combining

until I updated fglrx, the default in 8.10 does not give me this
message.  Anyhow, a manual mtrr modification fixed the problem but after
a little more digging passing the kernel parameter enable_mtrr_cleanup
did also the trick.  I found a thread in the lkml talking about setting
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT to 1 by default, which is the same
as passing enable_mtrr_cleanup from my understanding, in kernel 2.6.30
because now kernel seem better then X to do the cleanup.

Original thread: http://lkml.org/lkml/2009/2/19/108

For me the performance does not seem to change either way it just get
rid of the dmesg error.

-- 
MTRRs set up incorrectly with 4GB RAM -> X slow
https://bugs.launchpad.net/bugs/210780
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