MTRR fixup?

David Malone dwmalone at
Wed Sep 3 20:48:06 UTC 2008

On Wed, Sep 03, 2008 at 05:49:44AM +0200, Bernd Walter wrote:
> Some boards (including my Intel DG33BU) seem to have problems setting
> up the mtrr to cache all RAM.
> My system runs fast with 2G and ist about 6 times slower in buildworld
> with 6G RAM.
> I will try a BIOS update once Intels tells me why their update ISO
> just turn the system off instead of updating the BIOS - sigh.
> But it seems that Linux is doing some kind of fixup for MTRR:
> Can we do something similar?

You may be able to fix this by just using the memcontrol command -
it already lets you program the MTRRs.


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