[Xen-users] Seeing only 832 MB of 4 GB RAM on FC4 (2.6.12-1.1447_FC4xen0)

[thaiwiz Xen <xen@xxxxxxxxxxx>]

My machine is dual Xeon with 4GB RAM.
When I boot with 2.6.12-1.1447_FC4smp, all 4GB RAM is seen and used 
normally.
However, when I boot with 2.6.12-1.1447_FC4xen0, only 832MB RAM can be 
used. The warning message indicates  that I should use a HIGHMEM enabled 
kernel.
1. How can I define HIGHMEM?
2. Can it be done  with this binary FC4 release or I have to compile my 
own kernel and set HIGHMEM?
3. Anyone has  RPM built for this?

Thanks lists,

Attached is the message:

#dmesg
Linux version 2.6.12-1.1447_FC4xen0 
(bhcompile@xxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc
version 4.0.1 20050727 (Red Hat 4.0.1-5)) #1 SMP Fri Aug 26 21:13:28 EDT 
2005
BIOS-provided physical RAM map:
Xen: 0000000000100000 - 00000000cdb30000 (usable)
Warning only 832MB will be used.
Use a HIGHMEM enabled kernel.
832MB LOWMEM available.
Using x86 segment limits to approximate NX protection
On node 0 totalpages: 212992
 DMA zone: 212992 pages, LIFO batch:31
 Normal zone: 0 pages, LIFO batch:1
 HighMem zone: 0 pages, LIFO batch:1
found SMP MP-table at 000f67d0
DMI present.
Intel MultiProcessor Specification v1.4
   Virtual Wire compatibility mode.
OEM ID: INTEL    Product ID: Lindenhurst  APIC at: 0xFEE00000
I/O APIC #2 Version 32 at 0xFEC00000.
I/O APIC #3 Version 32 at 0xFEC10000.
Enabling APIC mode:  Flat.  Using 2 I/O APICs
Processors: 2
IRQ lockup detection disabled
Allocating PCI resources starting at cdc00000 (gap: cdb30000:324d0000)
...



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