Re: 64 vs 32 lenny
On Fri, 20 Mar 2009 23:08:03 -0400
Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> > In theory, with PAE segments you can address that memory with a 32-bit
> > OS, but in practice, 64-bit is required.
>
> Actually, practice suggests otherwise:
>
> % uname -a
> Linux pastel 2.6.28-1-686-bigmem #1 SMP Mon Feb 23 04:05:37 UTC 2009 i686 GNU/Linux
> % free
> total used free shared buffers cached
> Mem: 4148160 4018720 129440 0 41428 3293968
> -/+ buffers/cache: 683324 3464836
> Swap: 2097144 361292 1735852
> %
>
> so I can use all of my 4GB (except for 46MB eaten by the kernel) with my
> 32bit OS. This running a stock Debian kernel.
>
It's a different approach taken than the 1:3 gb split. You are paying a
performance penalty for accessing the higher part of the memory as it requires
trickery and you will probably see a gain by using a amd64 kernel (you can keep
the 32bit userspace)
>
> -- Stefan
>
>
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