Re: 2G memory split

[Jens Axboe]

On Tue, Jan 10 2006, Gerd Hoffmann wrote:
>   Hi,
> 
> >0xb0000000 is a much better default, but I didn't think that would fly
> >as a patch.
> 
> I think that will not fly with CONFIG_X86_PAE.  In PAE mode the 3rd pmd 
>  (for the 0xc0000000 => 0xffffffff kernel address range) is shared, 
> anything but 0xc000000 most likely needs some more hackery than just 
> changing PAGE_OFFSET.  As the whole point of this split patchery is to 
> avoid highmem in the first place it maybe makes sense to have some 
> "optimize for 1/2/4/more GB main memory" config option which in turn 
> picks sane PAGE_OFFSET+HIGHMEM+PAE settings?

The patch depends on NOHIGHMEM atm, so you can't select PAE and move the
page offset anyways.

-- 
Jens Axboe

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