kpanic on install >32GB of RAM

Jeremy Chadwick freebsd at
Fri Oct 15 16:28:32 UTC 2010

On Fri, Oct 15, 2010 at 09:27:14AM -0700, Jeremy Chadwick wrote:
> On Fri, Oct 15, 2010 at 09:04:53AM -0700, Sean Bruno wrote:
> > So, trying to get a massively overpowered HP box up with 7.3 amd64
> > version up and running.
> > 
> > I can't tell at the moment, but it looks like the installer kernel is
> > having issues with >32GB of RAM in this box.
> > 
> > Are we using the i386 kernel on amd64 installs?
> If you booted a FreeBSD image that has "amd64" in the ISO name, then the
> kernel is actually 64-bit (amd64).  The only i386 piece would be the
> bootloader.
> There's probably someone here who can help with the issue you describe,
> as there's occasional posts here and there from people who experience
> issues/problems when using very large amounts of RAM.

Oh, something I forgot -- make sure you review documentation for your
northbridge chipset (if there is one; if not, see specifications for
your processor since the memory controller is on-die).  Many have strict
limits.  The BIOS can also inhibit limits based on certain features.

| Jeremy Chadwick                                   jdc at |
| Parodius Networking              |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |

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