[Gllug] 4G Memory Restriction

[Alain Williams]

On Mon, Apr 10, 2006 at 02:26:56PM +0100, Tet wrote:
> On 4/10/06, Daniel P. Berrange <dan at berrange.com> wrote:
> 
> >You still really really want to use 64-bit kernel & OS if at all
> possible though.
> 
> Note that this only applies to x86 compatible chips. On sparc64, it
> turned out to be quite a big win to stick with a 32-bit userland with
> a 64-bit kernel, unless your application *needed* to be 64-bit (large
> databases and the like).

I guess that this is because 64 bit programs are bigger & use more dataspace,
this means that the programs do not fit so nicely into CPU cache. Is that correct ?

But, if you run both 32 & 64 bit programs on your box you are going to need to have
2 copies of the C library (& others) in RAM.... it gets complicated.

-- 
Alain Williams
Parliament Hill Computers Ltd.
Linux Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/

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