[CentOS] CENTOS 5 (X86 32 bits) only support 16 Gb RAM???

Pasi Kärkkäinen pasik at iki.fi
Wed Nov 17 21:15:44 UTC 2010

On Tue, Nov 16, 2010 at 04:14:01PM -0600, Barry Brimer wrote:
> Quoting James Bensley <jwbensley at gmail.com>:
> > Eh? How can you have 16GBs on a 32bit kernel?
> You can have up to 64GB using PAE
> <https://secure.wikimedia.org/wikipedia/en/wiki/Physical_Address_Extension>.

Yeah, but in reality you can't run 64GB 32bit PAE kernel.
All the lowmem would be used for page structs, and the system wouldn't be usable.

16GB PAE 32bit system still has some lowmem available..

-- Pasi

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