On 28 Jan 2018, at 15:57, Andre Albsmeier <andre.albsme...@siemens.com> wrote: > I have a lot of machines running with 4 GB physical RAM and, for > some reasons, I still have to use a 32 bits OS. > > All of them show something between 3 and 3.5 GB of RAM available > in dmesg but the brand new Supermicro A2SAV really shocked me: > > FreeBSD 11.1-STABLE #0: Mon Jan 15 06:57:10 CET 2018 > ... > real memory = 4294967296 (4096 MB) > avail memory = 1939558400 (1849 MB) > ... > > So do people have any ideas how I might get a bit closer to at least > 3 GB? I assume there are no FreeBSD knobs which might help but hope > dies last...
This is a common problem on i386. Most likely some ranges are reserved for I/O mappings, such as video cards. If you boot with -v, I think the kernel prints an overview of the physical ram chunks available? I don't know of any other way to get such an overview. Another option is to try PAE, but I have no idea how stable that is... -Dimitry
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