On Wed, 15 Dec 2010 12:42:04 -0800 (PST),  wrote:
> the default was 1:3, but can be changed fairly easily to 2:2. going 
> to 3:1
> or 3.5:.5 requires trickery (and keeping your fingers crossed that 
> you
> don't get tripped up by the kernel running out of address space)
>
> distro kernels may have different defaults than the vanilla kernel, 
> so you
> may be used to a different default.

 The default is the 1:3 split.  The lower 3G of address space is for the 
 process.
 The upper 1G is mapped to the first 1G of real RAM (where the kernel 
 sits.)

 http://kerneltrap.org/node/2450/7217
 http://mail.nl.linux.org/kernelnewbies/2005-09/msg00042.html

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       --MCP
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