what's the max ram size that linux kernel can support ?

[Lin-Bao Zhang]

http://www.redhat.com/rhel/compare/
I see redhat 6.x 's x86_64 version can support 2TB/64TB.
this support is from upstream kernel or redhat's patch ?
thanks very much for your sharing related information .

for example, kernel configuration item . if I want to recognize 2TB ,
how can we do ? steps ?
thanks again!

-Bob
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