[Gllug] 4G Memory Restriction

Tet tethys at gmail.com
Mon Apr 10 10:33:43 UTC 2006

On 4/10/06, Steve Nelson <sanelson at gmail.com> wrote:

> """4GB is the maximum any OS can address in 32-bits.
> However, Linux (and other OS) have strategies to cope with >4GB memory.

Yep. Essentially, 4GB is the limit addressable in 32 bits. However,
Intel's physical address extensions added an extra 4 bits, to allow
64GB of addressable memory. Under Linux, any single process can only
address 32 bits. However, the system as a whole can address 36 bits,
as I understand it.

Of course, these days, AMD have now made the decision simple -- just
go straight to 64 bits. Do not pass go, do not collect 200 pounds.
Anything else just doesn't make sense in today's world.

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