Date: Sun, 28 Jan 2018 17:05:54 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: Andre Albsmeier <Andre.Albsmeier@siemens.com> Cc: freebsd-stable@freebsd.org Subject: Re: i386 with 4GB RAM: less than 2GB available on A2SAV (Intel Atom E3940) Message-ID: <FF56490E-BD56-4BF1-B1D7-866ACEB32DC4@FreeBSD.org> In-Reply-To: <20180128145703.GA80724@bali> References: <20180128145703.GA80724@bali>
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--Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii 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. >=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 --Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCWm304gAKCRCwXqMKLiCW o7yMAKDVrmxIEzH+TqDgiVERycLOorYS8QCg/3Rq0YoZ7cKbrTdBbsLGGB6O1P8= =DpaO -----END PGP SIGNATURE----- --Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD--
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