Wakko Warner wrote:
Tom Moore wrote:
Thank you for the reply back. Your answer makes perfect sense to me,
and it is what I had suspected but was not sure about. The math seems
to indicate that 4Gb of ram plus 1Gb of PCI address space equals 5Gb of
memory space. So it does sound like I should have a larger kernel model.
What confused me the most (and still does), is the help message string
that is presented for the CONFIG_HIGHMEM4G option:
"Select this if you have a 32-bit processor and between 1 and 4
gigabytes of physical RAM."
4 is not between 1 and 4.
This idiomatic phrase suggests to me that it applies when ram is >= 1Gb
and <= 4Gb. The fact that we interpret it differently indicates that it
could be more clearly stated. If your interpretation is correct, then
what would this mean when a machine had 3.5Gb of ram installed?
Well that sounds like the amount of memory that I have, so that is what
I selected.
You should select CONFIG_HIGHMEM64G.
Also, although I know what PAE stands for, I don't know how to select it
when building a kernel. Would I get this from the CONFIG_HIGHMEM64G
option? The help text for that says:
"Select this if you have a 32-bit processor and more than 4 gigabytes
of physical RAM."
Personally, I feel the wording should say:
Select this if you have a 32-bit processor and 4 or more gigabytes of
physical RAM.
It may not hurt to say 3 or more, but I'm not that familiar with x86
hardware in regards to memory.
Ok, so it appears that this one is wrong also. If someone could explain
the rules that apply, I would be happy to prepare a patch to the Kconfig
script. I don't consider myself to be completely stupid, and if the
help text was a bit more clear I wouldn't be asking these questions.
I'm sure that other pilgrims will follow along later with the same
questions.
This does not sound like it applies to my hardware. There is something
wrong with my understanding, or with these message strings. I am still
confused.
It does.
Here's my system (4gb of memory):
total used free shared buffers cached
Mem: 3619996 3289352 330644 0 469764 2025416
-/+ buffers/cache: 794172 2825824
Swap: 0 0 0
I know it says 3.6gb of memory, but 4gb is installed. I had 5gb in this
machine and I saw all 5gb. This is a 32-bit dual xeon (12gb max memory)
I would be interested to know where the last 400mb of memory went.
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