Re: 1GB RAM is missing.
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On 10/23/07 18:00, Stephen Cormier wrote:
> On October 23, 2007 05:32:55 pm Ron Johnson wrote:
>> On 10/23/07 14:16, Stephen Cormier wrote:
>> [snip]
>>
>>> You are going to have to accept that you are never going to get all 4gb
>>> running a 32bit install due to the limitations of using 32bit where
>>> things
>> At the pid level, or at the OS level?
>
> I take it by pid you mean a process if so then it is my understanding IIRC
> that on a 32bit install you are limited to 2gb maximum of memory that can be
> used by a single process. The limitations I talk about here are BIOS/arch
> limited where a certain amount of memory is reserved for things like your
> video card, interrupts ... this has to be mapped below 4gb so a hole in the
> memory has to be there for it to be used, like back in the DOS days where you
> had the 15mb-16mb memory hole option in the BIOS. I believe that was just
> video related though if my memory serves me but the principle is the same the
> space needs to be reserved on 32bit thus lowers the total ram available on
> 64bit it is not needed to be reserved so you get all the memory.
Modern 32 bit processors and chipsets map around those limitations.
For many years there have been 32-bit server motherboards that
accept and use (in both Linux and Windows) up to 64GB RAM.
http://en.wikipedia.org/wiki/Physical_Address_Extension
http://kerneltrap.org/node/2450
- --
Ron Johnson, Jr.
Jefferson LA USA
Give a man a fish, and he eats for a day.
Hit him with a fish, and he goes away for good!
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