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

D. Hugh Redelmeier hugh at mimosa.com
Fri Sep 19 02:08:25 UTC 2008


2.6.27 has been ported to Hardy (a good thing: Hardy is LTS).
Unfortunately, it doesn't quite work because v86d is needed.  See
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/236937/comments/3

I've written an experimental userland program to rejig MTRRs.  Read
about it here: https://bugs.launchpad.net/ubuntu/+source/linux-
restricted-modules-2.6.24/+bug/224404/comments/42

It won't always work: there may not be enough MTRRs.  If you tell the
program the address range you need unnested, it may require fewer MTRRs.

Please send me feedback.  Among other information, please include
/proc/mtrr

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