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Re: [Xen-users] X86_64 and 4GB RAM

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "John Hannfield" <hal9020@xxxxxxxxx>
  • Date: Sat, 28 Apr 2007 17:07:36 +0100
  • Cc: rkupka+Listy.Xen@xxxxxxxxxxxxx
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi Rafal.

That is odd. So it only report about 4 MB or memory?

Please send memory map from linux kernel that correctly detects all

OK, for a vanilla linux boot (Debian Etch AMD64), I get this e820 in the

BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009dc00 (usable)
BIOS-e820: 000000000009dc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000bfff0000 (usable)
BIOS-e820: 00000000bfff0000 - 00000000bfffe000 (ACPI data)
BIOS-e820: 00000000bfffe000 - 00000000c0000000 (ACPI NVS)
BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
DMI present.

and the Vanilla linux boot can access all 4GB of memory.
However if I boot xen 3.0.3  my 'xm dmesg' is this:

(XEN) Command line: /boot/xen-3.0.3-0.gz dom0_mem=262144
com1=115200,8n1 console=vga,com1
(XEN) Physical RAM map:
(XEN)  0000000000000000 - 000000000009dc00 (usable)
(XEN)  0000000000100000 - 00000000bfff0000 (usable)
(XEN) System RAM: 3071MB (3145268kB)
(XEN) Xen heap: 14MB (14384kB)
(XEN) found SMP MP-table at 000ff780
(XEN) DMI present.
(XEN) Using APIC driver default

Any ideas what the problem is?

FYI - In BIOS I have "Memory Hole ReMapping"  set to "enabled", and
"MTRR Mapping" set to "Discreet".



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