Messages in this thread | | | Date | Mon, 4 Jun 2007 18:28:40 -0400 | From | Wakko Warner <> | Subject | Re: 4Gb ram not showing up |
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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.
> 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.
> 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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