Re: Memory question

03.01.2023 20:04, Eivind Nicolay Evensen wrote:

> This might be more related to a bios setting or issue, but I hope
> somebody can give me hints in the right direction to remedy or
> at least diagnose this issue further.
> 
> I installed more memory in one machine and now I see this
> in dmesg:
> 
> real memory  = 25769803776 (24576 MB)
> avail memory = 8237150208 (7855 MB)
> 
> Real should be right, from before there were two 4 GB dimms in there,
> and I inserted two more 8 GB ones.
> 
> Transcribed from BIOS:
> 
> DIMM(s)			1		2		3		4
> Installed Size		8192		8192		4096		4096
> Enabled Size		8192		8192		4096		4096
> Total Size		24576
> 
> I was wondering if the reason could be that this machine has been updated
> since older versions and bootloader may be old or whatever, so I also tried
> booting a linux. However, that also only uses 8 GB, and says (at least in a
> way I understand) less about what it can really see.
> 
> This is amd64 FreeBSD 13.1.
> 
> Is there any way I can use the rest of the memory? Or at least find out
> which dimms it is actually using?

I was in similar situation once. There was Atom-based hardware setup with CPU not having embedded memory controller;
instead, it used memory controller on motherboard. That memory controller had similar limitation.
One cannot overcome it.

You should specify your hardware.