"Joachim Deguara" <[EMAIL PROTECTED]> wrote:
> James D. Parra wrote:
> > Hello,
> >
> > Installed 4GB of physical memory, however only 3GB appear;
> >
> > # cat /proc/meminfo
> > MemTotal: 3342628 kB
>
> It sounds like you need to go into the BIOS and ask for "Memwhole
> remapping" and set it to "Software". This happens because PCI takes the
> address space from 3-4GB (staying under the 32bit boundary) and maps
> over where memory may be so we want the BIOS to map that memory elsewhere.
(disclaimer: I work for AMD in the CPU architecture team)
Remapping in the BIOS is possible with all current AMD parts:
-- First off, some BIOSes have bugs, so test it out before just using it!
-- If this is a pre-rev-E part (C0 or CG), then you can perform
"Software" remapping, but it slows down memory access a bit
on Opteron systems.
-- If this is a Rev E or later part, then you can perform "Hardware"
remapping as well, which has no performance cost.
I'd recommend using the "Hardware" method if you have a Rev E or later
Opteron part.
~~~~~~~
Thank you for your responses. I used 'Hardware' for the Memwhole remapping.
What anomalies might I expect if using 'Hardware' is not the right choice?
Again, many thanks.
~James
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