Re: PROBLEM: Linux 2.6.0-test11 only lets me use 1GB out of 2GB ram.

William Lee Irwin III
2003-12-11T05:41:28Z

On Thu, Dec 11, 2003 at 12:33:39AM -0500, Ed Sweetman wrote:
> I thought highmem wasn't necesarily needed for memory <=2GB? Highmem
> incurs some performance hits doesn't it and so the urge to move to it
> with only 2GB is not very attractive. Anyways i'm just interested in if
> that's the case or not since 2GB is easy to get to these days and i had
> heard that highmem could be avoided passed the 1GB barrier.

You're probably thinking of 2:2 split patches.

2:2 splits are at least technically ABI violations, which is probably
why this isn't merged etc. Applications sensitive to it are uncommon.

Yes, the SVR4 i386 ELF/ABI spec literally mandates 0xC0000000 as the
top of the process address space.

-- wli