Re: i386 vs x86_64

From: Bruce Guenter <lists-slg_at_no.spam.please>
Date: Thu Dec 13 2007 - 13:16:58 CST

On Thu, Dec 13, 2007 at 12:49:32PM -0600, Scott Walde wrote:
> Bruce Guenter wrote:
>> Not completely accurate. i386 Linux will indeed have problems using the
>> entire first 4GB, but it can access up to 64GB of RAM if your
>> motherboard can handle it. Note that a number of motherboards that
>> advertise that they can handle 4GB of RAM have bugs that prevent
>> accessing the top 1GB.
>>
> Perhaps I misunderstand this, but I seem to be using the whole 4GB of RAM
> in this box:
>
> scott@fileserver:~$ cat /proc/meminfo
> MemTotal: 4149616 kB

4GB of RAM is 4194304 kB. The difference here is 44688 kB. In this
difference, there will be your video card and other IO bits. /proc/mtrr
and /proc/iomem should tell you more about what is taking up the address
space.

-- 
Bruce Guenter <bruce_at_untroubled.org>                http://untroubled.org/

Received on Thu Dec 13 13:17:07 2007

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