On Wed, Dec 16, 2020 at 2:22 PM <thelma@sys-concept.com> wrote:

> I run Memtest86 on my old box and it completed 1pass without any errors.
> Memtest86 reports 16G memory
>
> When I boot Gentoo it shows only 3282Mb
> free -m
>               total        used        free      shared  buff/cache
> available
> Mem:           3282         125        2475           7         680
>   3033
>
> Is it a motherboard? How to test it?
>
>
Are you perhaps booting a 32-bit kernel? A 32 bit kernel is not going to
see all 16GB of RAM, only what fits in its 32-bit address space. You need a
64-bit kernel (or a 32-bit kernel with Physical Address Extensions enabled)
to be able to see all the RAM.
-- 
Manuel A. McLure WW1FA <manuel@mclure.org> <http://www.mclure.org>
...for in Ulthar, according to an ancient and significant law,
no man may kill a cat.                       -- H.P. Lovecraft