Messages in this thread | | | Subject | Re: 4GB memory and Intel Dual-Core system | From | Marcel Holtmann <> | Date | Thu, 27 Oct 2005 22:51:18 +0200 |
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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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