Re: 4GB memory and Intel Dual-Core system

[Marcel Holtmann <marcel@holtmann.org>]

Hi Roland,

>     Marcel> The BIOS and dmidecode tells me that I have 4 GB of RAM
>     Marcel> installed and I don't have any idea where to look for
>     Marcel> details. What information do you need to analyze this?
> 
> Look at the e820 dump in your kernel bootlog.  I'll bet you'll see a
> big chunk of reserved address space.  Do you have any PCI devices like
> video cards that use a lot of PCI address space?

BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000edbb0 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 00000000cec11000 (usable)
 BIOS-e820: 00000000cec11000 - 00000000cee12000 (ACPI NVS)
 BIOS-e820: 00000000cee12000 - 00000000cf68f000 (usable)
 BIOS-e820: 00000000cf68f000 - 00000000cf6e9000 (ACPI NVS)
 BIOS-e820: 00000000cf6e9000 - 00000000cf6ed000 (usable)
 BIOS-e820: 00000000cf6ed000 - 00000000cf6ff000 (ACPI data)
 BIOS-e820: 00000000cf6ff000 - 00000000cf700000 (usable)

I see the stuff above, but the system doesn't contain any PCI device. I
didn't install a PCI-Express video card, because I still use the onboard
card.

> I don't know if EM64T systems (or whatever the right term is) have a
> way of remapping some RAM above 4 GB so that you can use all your
> memory in a case like this.

The kernel is compiled for x86_64 and the term EM64T is correct. The
important question is now how do I remap that memory. Loosing almost a
full GB of memory wasn't my plan when upgrading to 4 GB.

Regards

Marcel


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