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SubjectRe: > 1GB RAM on x86 ?
Date
"Larry M. Augustin" <lma@varesearch.com> writes:

> We're testing some x86 systems with more than 1GB of RAM. Linux on
> x86 seems to be limited to 1GB of physical memory. This suprised me
> a bit since I thought 386 PTE's had 20 bits for physical page
> addresses (4GB physical). Is there a 1GB physical limit, what's the
> reason for the limit, and what would need to change to increase this
> to 4GB? (i.e. Where did those other 2 bits go?)

Linus told me the (effective?) limit is actually lower than 1GB for
possibly different reasons than the ones you mention (allocation of
kernel-space memory vs. user-space memory?), maybe 768 MB.

Basically, he said that some settings need to be changed, but it
sounded like a minor change.

--
Daniel Quinlan (at work) Linux, our last best hope for Unix
quinlan@transmeta.com http://www.pathname.com/~quinlan/

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