Lennart Sorensen wrote:
On Tue, May 17, 2005 at 01:35:28PM +0100, Koen Tavernier wrote:
I've been running a dual opteron box with 2GB for a few days. Today I
added 2GB to the box, all recognised by the motherboard, but after
booting into linux (with the stock 2.6.11 debian kernel) free only
reports 3344996 Kb. I thought the 64 bit kernel avoided all problems
with having lots of memory? Or should I pass the kernel a parameter?
I had a quick search through the list but couldn't see anything relevant.
Does your bios have an option for mapping memory from 3-4GB up to 4-5GB
so the PCI memory hole at 3-4GB won't overlap with it?
This is sometimes called a memory hole (and you want to make one).
The kernel can then use all the memory since 4GB is not a limit for it.
Len Sorensen
This was in deed the culprit! Once you had mentioned the memory hole I
was able to find a lot more information on this. Setting the memory hole
mapping to [Software] on the Tyan motherboard gave me 4GB immediately.
Thanks a lot for your help!
Koen.
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