On Thursday, 25 October 2007 23:58, H. Peter Anvin wrote:
> J.A. Magallon wrote:
> > Hi...
> >
> > I have some Quad-Opteron boxes with 4Gb memory and two of them are
> > running two different Linux distros.
> >
> > Box one sees 4Gb of memory, but box two just sees 3.
> > Their mtrr setups are different:
> >
> > Why ? Is it a bios setup problem ? A kernel problem ?
> > grep HIGHMEN in configs for both kernels does not give anything, so
> > I still understand less this thing...
> >
>
> It would depend on how the BIOS programmed the memory controllers. For
> 32-bit (and lots of device) compatibility, a memory hole is required
> below 4 GB. Not all memory controllers can remap memory in the 3-4 GB
> range above the 4 GB memory; I'm not sure if that varies with the
> different Opteron processors.
It shouldn't, AFAICS.
Greetings,
Rafael
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