How to use all the RAM on a Debian server?

Question

linux

On a server running Debian, 1 GB of RAM was added to the same amount. As a result, only BIOS and dmesg displays 2 GB, the rest is 1 GB.

~$dmesg | grep Memory
[ 0.000000] Memory: 1794748k/2096128k available (3438k kernel code, 2904k absent, 298476k reserved, 3301k data, 584k init)

~$ top
KiB Mem: 1038100 total, 1018516 used, 19584 free, 58072 buffers

~$ htop
Mem: 127/1013MB

:~$ cat /proc/meminfo
MemTotal: 1038100 kB
MemFree: 18228 kB
Buffers: 58288 kB
Cached: 831844 kB

~$ free -m
total used free shared buffers cached
Mem: 1013 994 19 0 56 811

What is going on in general? What is done wrong?

Answer 1

[ 0.000000] Memory: 1794748k/2096128k available (3438k kernel code, 2904k absent, 298476k reserved, 3301k data, 584k init)

Give the full kernel boot log, not just this line.