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Re: where's my memory?

On 07/14/2009 12:01 PM, Joerg Bergmann wrote:
Am 14.07.2009 16:39, schrieb Alan Cox:
On Tue, 14 Jul 2009 07:43:06 -0400
Neal Becker<ndbecker2 gmail com> wrote:

I have a argument with another user about memory. He claims that on
linux on his 4G Dell machine, top only reports 3.something memory, he
the missing space is for pci bus. I think this is only because he's
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.


On my F11 install running the PAE kernel, I get 4045988k as the total in top. Some machines have difficulty using all available ram for many reasons. I also noticed that an x86_64 kernel on the same machine gave me the 3.9gb as reported.

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