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

[Nick Piggin]

Raul Miller wrote:

> On Wed, Dec 10, 2003 at 11:06:46PM -0600, Donald Maner wrote:
>
> > The kernel you're using WAS compiled with CONFIG_HIGHMEM4G=y, correct?
>
> No.
>
>
> On Thu, Dec 11, 2003 at 04:13:25PM +1100, Nick Piggin wrote:
>
> > Or ARCH=x86_64 ?
>
> Yes.  Well, no... I don't see that option in my .config.  I
> did specify the amd64 bit archictecture, but I don't know
> what that means in .config terms.  Here's what's set under
> "# Processor type and features":

This optimises the kernel for your chip when its in 32-bit mode.
make 'ARCH=x64_64' to make a 64-bit kernel, however you would
need a cross compiler.

> On Thu, Dec 11, 2003 at 04:48:51PM +1100, Nick Piggin wrote:
>
> > At any rate, Raul, highmem shouldn't hurt your performance significantly
> > with the 2.6 kernel. If it does then send a note to the list.
>
> Ok, I guess I'll try that (tomorrow, unless I hear any better suggestions
> before then).
>
> [I thought highmem was something completely different -- that it declared
> a watermark and memory above that watermark was treated differently.
> However, I guess I understand that this might have the side effect of
> bumping things around such that I get access to the memory.]

No you're right, but the kernel tries not to use highmem for data it
accesses a lot. cache and anonymous memory for example.


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