On Thu, 9 Dec 1999 19:40:38 -0600 , nathan.zook@amd.com said:
> I've been looking at the pfn (page frame number) stuff, and I'm confused on
> one point: Is the maximum supported memory 64G?
Yes.
> Or is it 16T?
No. We only have 1G permanently mapped. We have a page information
database ("mem_map" in the kernel) which needs to fit in that 1G. The
more pages you have, the more overhead we need to fit into the bottom
1G. That imposes hard limits right now which prevent us going anywhere
near 16T in size.
> OTOH, we COULD say that Linux is 16T-ready--couldn't we?
No. On Intel we have the above limitation, and on 64-bit hardware we
have other IO issues concerning PCI. A lot of the core is ready, yes,
but there is still work needing done.
--Stephen
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