Messages in this thread | | | From | Daniel Quinlan <> | Subject | Re: > 1GB RAM on x86 ? | Date | 03 Jul 1997 01:08:14 -0700 |
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"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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