where's my memory?

[Joerg Bergmann]

Am 14.07.2009 16:39, schrieb 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.
>

Just a remark: On my fedora 11 system (phenom II, 4GB RAM,
32 bit, PAE) top reports 3.9GB RAM. On my opinion, this is
thanks to PAE.

Joerg