where's my memory?

[Alan Cox]

On Tue, 14 Jul 2009 07:43:06 -0400
Neal Becker <ndbecker2 at gmail.com> wrote:

> I have a argument with another user about memory.  He claims that on running 
> linux on his 4G Dell machine, top only reports 3.something memory, he says 
> the missing space is for pci bus.  I think this is only because he's running 
> 32 bit and that 64 bit would give all the memory.

Plenty of chipsets don't support mapping the RAM covered by the PCI
window up to the end of memory, especially older ones.