Date: Mon, 29 Jan 2018 09:12:59 -0600 From: Eric van Gyzen <eric@vangyzen.net> To: freebsd-stable@freebsd.org Subject: Re: i386 with 4GB RAM: less than 2GB available on A2SAV (Intel Atom E3940) Message-ID: <f430996f-2af7-d6d5-b911-69978e0ec1f5@vangyzen.net> In-Reply-To: <FF56490E-BD56-4BF1-B1D7-866ACEB32DC4@FreeBSD.org> References: <20180128145703.GA80724@bali> <FF56490E-BD56-4BF1-B1D7-866ACEB32DC4@FreeBSD.org>
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On 01/28/2018 10:05, Dimitry Andric wrote: > On 28 Jan 2018, at 15:57, Andre Albsmeier <Andre.Albsmeier@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. sysctl machdep.smap on BIOS, machdep.efi_map on UEFI. Eric
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