Date: Tue, 30 Jan 2018 08:00:18 +0100 From: Andre Albsmeier <Andre.Albsmeier@siemens.com> To: Dimitry Andric <dim@FreeBSD.org> Cc: Andre Albsmeier <Andre.Albsmeier@siemens.com>, freebsd-stable@freebsd.org Subject: Re: i386 with 4GB RAM: less than 2GB available on A2SAV (Intel Atom E3940) Message-ID: <20180130070018.GA43715@bali> 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 Sun, 28-Jan-2018 at 17:05:54 +0100, 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
Yes, it does:
real memory = 4294967296 (4096 MB)
Physical memory chunk(s):
0x0000000000001000 - 0x000000000009afff, 630784 bytes (154 pages)
0x0000000000100000 - 0x00000000003fffff, 3145728 bytes (768 pages)
0x0000000000c28000 - 0x000000001fffffff, 524124160 bytes (127960 pages)
0x0000000022151000 - 0x0000000075733fff, 1398681600 bytes (341475 pages)
0x000000007998e000 - 0x0000000079a5efff, 856064 bytes (209 pages)
0x000000007a151000 - 0x000000007a4bffff, 3600384 bytes (879 pages)
0x000000007a4eb000 - 0x000000007aae2fff, 6258688 bytes (1528 pages)
0x000000007aae5000 - 0x000000007afeffff, 5287936 bytes (1291 pages)
avail memory = 1939800064 (1849 MB)
-Andre
> 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
>
--
Win98: useless extension to a minor patch release for 32-bit extensions
and a graphical shell for a 16-bit patch to an 8-bit operating
system originally coded for a 4-bit microprocessor, written by
a 2-bit company that can't stand for 1 bit of competition.
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