Re: Which processor mode?

[Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>]

On Thu, 2003-05-01 at 23:41, Robert Weber wrote:
> > On Thu, May 01, 2003 at 03:29:22PM -0600, Robert Weber wrote:
> > > 
> > > This page seems to imply the os is designed for the "compatibility" mode of
> > > AMD64.  This gives support for large memory addresses, but not the extended
> > > register space that "Long" mode offers.  Will there be a release that is in
> > > "long" or 64 bit only mode?  
> > 
> > This technology preview is all 64-bit mode (both user mode and kernel).
> > 
> 
> I hope you mean "long" mode.  Compatibility mode is technically a 64 bit
> mode as well.  Long mode *Cannot* run 32 bit apps, so this is an important
> distinction.

I think you're a bit confused (or we are ;)
Basically the kernel is 64 bits and has all 16 registers, and userspace
is either 64 bit or 32 bit, depending on the binary type.

>   While I am asking about these technical details, is the
> kernel NUMA aware?

the smp kernel is compiled with the NUMA config option for AMD64,
however we have not done additional steps in addition to that to tune it
for numa.

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