Is it possible to see memory over 3GB on 32-bit FreeBSD?

Erik Trulsson ertr1013 at
Wed Feb 17 20:23:38 UTC 2010

On Wed, Feb 17, 2010 at 03:02:17PM -0500, Bill Moran wrote:
> In response to Yuri <yuri at>:
> > I know that 32-bot Linux can see something like 3.6GB.
> > Is this possible on FreeBSD?
> > 
> > I see this message in system log:
> > real memory  = 6442450944 (6144 MB)
> > avail memory = 3123482624 (2978 MB)
> Most systems usually see about 3.5G ... don't know why FreeBSD would see
> less than that.

It very much depends on what hardware you have in the system.  Just
about every expansion card or I/O device will reserve some of the
address space for its own use.  Some devices will need a lot of space - 
a graphics card with 256MB of RAM on it will use (at least) 256MB of
the address space for example.

> amd64 is the way to go.  If you _must_ stick with i386, you can try PAE
> in your kernel, but I don't know if that's even supported any more.
> -- 
> Bill Moran
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<Insert your favourite quote here.>
Erik Trulsson
ertr1013 at

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