FreeBSD 7.0 and RAM limit

[Rodolfo Pellegrino]

On Sat, Jul 5, 2008 at 8:01 AM, Robert Heron <robert at heron.pl> wrote:

> Hi,
>
> I use:
>
> FreeBSD 7.0-R on i386 server with motherboard S5000VSA and 6GB RAM onboard.
> BIOS version - 88 (the latest)
>
> Kernel includes: options                MAXMEM=(6*1024*1024)
>
> And FreeBSD reports only:
>
> real memory  = 2680160256 (2556 MB)
> avail memory = 2617892864 (2496 MB)
>
> Why? What is wrong that FreeBSD sees only about 2.5GB instead of 6GB?
>
> Robert
>

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Look at system memory map:

 http://www.codinghorror.com/blog/images/intel-system-memory-map.png

As a 32-bit system, your limit is 4 GB, subtracting PCI devices, sound and
so on like the linked PNG.

Rodolfo Bojo Pellegrino