On Tue, Jan 30, 2018 at 12:11 AM, Andre Albsmeier < andre.albsme...@siemens.com> wrote:
> On Sun, 28-Jan-2018 at 10:32:44 -0600, Mike Karels wrote: > > > 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. > > > >=20 > > > > 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: > > > >=20 > > > > FreeBSD 11.1-STABLE #0: Mon Jan 15 06:57:10 CET 2018 > > > > ... > > > > real memory =3D 4294967296 (4096 MB) > > > > avail memory =3D 1939558400 (1849 MB) > > > > ... > > > >=20 > > > > 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 > > > > I suspect that the unavailable RAM has been mapped above 4 GB by the > BIOS. > > > > About PAE: at $JOB, we have a FreeBSD 8.2 system that has been running > > PAE reliably since 8.2 was new. Also, we ship amd64 systems that run > > mostly 32-bit binaries, which works well. > > But can the entire userland be 32 bit only? > Sure. I do this with jails. It's no problem to have a 32-bit jail on a 64-bit kernel. Kernel modules would be an issue, though. If you need any, you'll have to find a way for the 64-bit machines to find 64-bit kernel modules. > > Maybe I'll try the PAE thing... > _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
