> 1GB RAM on x86 ?

Larry M. Augustin (lma@varesearch.com)
Wed, 2 Jul 1997 16:58:40 -0700

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?)

I also seem to be seeing a limit on swap space of 1GB. What about
increasing that too?

Thanks,

Larry