FC3 x86_64 >2G memory problem

[Mogens Kjaer <mk@xxxxxx>]

First: Is this the right list to post
a question about some memory troubles
I've had trying to install the x86_64
version of Fedora on a 2xIntel Xeon
machine with EM64T?

If not please tell me where I can
get help on this problem:

The machine is an HP XW8200 workstation,
2x3.6 GHz Xeon EM64T, 4G of memory, one
SATA disk.

The problem is this:

I've set it up to dualboot FC3-ix86 and
FC3-x86_64.

Installing the 32 bit version of FC3 went
without problems. All memory is available,
/proc/meminfo gives:

MemTotal: 4145268 kB

The problem is now, that FC3-x86_64 won't
install at all. The disk is not recognized
during the install.

This was a bit strange, as we just have had
a similar workstation on loan from HP (with
only 2G of RAM), on this FC3-x86_64 installed
without problems.

I tried removing 2G, and yes, now the installation
went without problems. I ran up2date, and
updated everything (the kernel is now
2.6.9-1.681_FC3smp). Shut down the machine,
added the 2G RAM, but then it can't boot,
the disk is not found.

I tried to experiment with the mem=XXXXM kernel
option, and yes, this makes the machine boot
(which means that I probably could have done
the installation without removing memory).

But the result is very strange:

mem=	Total memory from /proc/meminfo
value	MemTotal

2048M	2057732
3072M	3090824
3584M	3083640
4096M	3005384

The machine boots fine, even with mem=4096M.

How do I get FC3-x86_64 to use all my memory?

Mogens
--
Mogens Kjaer, Carlsberg A/S, Computer Department
Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark
Phone: +45 33 27 53 25, Fax: +45 33 27 47 08
Email: mk@xxxxxx Homepage: http://www.crc.dk

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