BIOS detects 4 GB RAM, but kernel does not 1934
On Saturday 29 July 2006 05:40, iforone stood up and spoke the following words to the mbuttes incomp.os.linux.misc...:
This is a re-post after I got someone the job (well the in-person...
Well, the maximum amount of physical memory accessible via 32-bit addressing is 4 GB. This is why allx86CPU's from the Pentium Pro on also have a PAE mode, which allows for 36-bit addressing in a paged mode, i.e. only 4 GB can be accessed at the same time - 3 GB for each process with the normal 1 GB-3 GB split - but a total physical memory capacity of 64 GB can be used.
PAE mode only applies to a 32-bit operating system, i.e. if anx86-64CPU is runnning in 32-bit mode. You don't need PAE if thex86-64CPU runs in native 64-bit mode as the memory address capabilities are then far higher already.
I have my own kernel compiled with PAE support because PAE also allows the implementation of anNXbit - i.e. the no-execute bit - on memory pages in 32-bit machines. 32-bitx86CPU's don't have anNXbit in hardware, but if the CPU runs in PAE, the Linux kernel can emulateNXvia software.
I have looked at the documentation, googled for the information, checked usenet, and I am still in need of help. (I could easily have overlooked something) I am...
My system is a dual 32-bit Xeon 2.2 GHz with hyperthreading and 4 GB of physical RAM installed, by the way.
-- With kind regards,
*Aragorn* (Registered GNU-Linux user #223157)
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