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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