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SubjectRe: I'm having 4GB RAM, but Linux sees just 3GB???
Christian Parpart wrote:
> Has anyone a hint for my WHY this is happening and HOW I could get rid of it?

This is because there is a PCI memory hole of about 1GB of space on the
x86_64 platform. Basically it overlays the address space of the RAM that
you have.

You can try to enable memory hoisting (it may be called software memory
hole in your bios). This will try to remap you RAM above the 4GB
boundary so that the PCI space and your RAMs address space do not
conflict. Unfortunately, this does not work particularly well...

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