Re: 1GB of RAM memory is missing

On Mon, 22 Oct 2007 16:16:48 +0000, greymaus wrote:

On 2007-10-22, General Schvantzkopf <schvantzkopf@xxxxxxxxx> wrote:
On Sun, 21 Oct 2007 15:18:11 -0700, pgega wrote:

I meet the opinion that I should use amd64 architecture instead of
x86. Because x66 can handle up to 4GiB of RAM, but some of it will be
allocated to hardware, is it right ?


I have a AMD64x2 system, using a none-SMP kernel, 1 Gig of memory shows
up, using a SMP kernal, 2.5gigs show up. (2.5 gigs installed)

The x86 has a lot of memory management modes many of which are obsolete
but are maintained for compatibility reasons. In addition to the 4G 32
bit mode, the 64G PAE 32 bit mode and the modern 64 bit mode there is a
1G mode. Linux supports all of them. The non-SMP kernel that you have
installed must have been compiled with the 1G mode. There is absolutely
no reason to use that kernel especially on an X2 system.

.

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