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

Martin J. Bligh
2003-12-11T07:11:31Z

--William Lee Irwin III <wli@holomorphy.com> wrote (on Wednesday, December 10, 2003 21:41:11 -0800):

> 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.

You mean like we place the stack in the "ABI compliant place"?
Yeah, right ;-)

M.