[Xen-users] 4GB memory installed, 3.5GB shown (Xen 3.2 + PAE)

[Wouter de Geus <benv@xxxxxxxxxxxxx>]

Hello,

I have recently upgraded one of my machines, both in hardware and Xen version.
In the old situation it had 3GB of memory and Xen 3.1, worked like a charm.
After upgrading it has 4GB of memory and Xen 3.2.

However, only 3.5GB of the memory is available to xen.
(xm info gives
  total_memory           : 3573 )

I've read about the grub 0.97 bug, so I patched it.
However, that has absolutely no effect.

Grub output:
grub> displaymem 
 EISA Memory BIOS Interface is present
 Address Map BIOS Interface is present
 Lower memory: 640K, Upper memory (to first chipset hole): 3072K
 [Address Range Descriptor entries immediately follow (values are 64-bit)]
   Usable RAM:  Base Address:  0x0 X 4GB + 0x0,
      Length:   0x0 X 4GB + 0xa0000 bytes
   Reserved:  Base Address:  0x0 X 4GB + 0xa0000,
      Length:   0x0 X 4GB + 0x60000 bytes
   Usable RAM:  Base Address:  0x0 X 4GB + 0x100000,
      Length:   0x0 X 4GB + 0x300000 bytes

>From xm dmesg:
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009fc00 (usable)
(XEN)  000000000009fc00 - 00000000000a0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000df65b000 (usable)
(XEN)  00000000df65b000 - 00000000df6e8000 (ACPI NVS)
(XEN)  00000000df6e8000 - 00000000df6ec000 (usable)
(XEN)  00000000df6ec000 - 00000000df6ff000 (ACPI data)
(XEN)  00000000df6ff000 - 00000000df700000 (usable)
(XEN) System RAM: 3573MB (3659772kB)

Does anyone have any idea what might make those extra 500-ish MBs available to 
Xen? :)

Thanks for reading.

Wouter.
-- 

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