Re: perspectives on 32 bit vs 64 bit
lsorense@csclub.uwaterloo.ca (Lennart Sorensen) writes:
> On Thu, Oct 13, 2005 at 03:09:57PM +0200, Goswin von Brederlow wrote:
>> Intel has some extension that allows to address up to 64GB ram and
>> linux supports that. But I'm not sure if that is also supported in
>> 32bit mode on em64t. Wouldn't think so.
>
> It is. x86_64 architecture supports everything a P4 supports including
> PAE, SSE, SSE2 (and SSE3 in newer versions).
The question is wether linux supports it too in that mode. It has to
remap the 64bit page tables into the strange 64GB address setup.
> After all who would build a chip that runs x86 and is destined for
> servers that does not support existing methods of allowing more than 4GB
> ram for 32bit OSs?
>
> If you look at /proc/cpuinfo you will see the pae flag mentioned on all
> amd64 systems. That means it can do 64 rather than just 4GB ram in
> 32bit mode, if the OS supports PAE.
IF. That is the big question.
> Len Sorensen
MfG
Goswin
Reply to: