Jeff V. Merkey wrote:
Linus Torvalds wrote:
On Tue, 10 Jan 2006, Martin Bligh wrote:
The non-1GB-aligned ones need to be disbarred when PAE is on, I think.
Well, right now _all_ the non-3:1 cases need to be disbarred. I think
we depend on the kernel mapping only ever being the _one_ last entry
in the top-level page table, which is only true with the 3:1 mapping.
But I didn't check.
No. It works fine (or seems to) with 2:2 mapping. I've tested with
these extensively
and am shipping products on the 1U appliances with 2:2 and I have
never seen any problems
with 2.6.9-2.6.13.
The only unpleasant side affect with 3:1 is user apps seem to rely on
swap space
a little more than I like -- perhaps this is the side affect you are
referring to?
RH ES uses 4:4 which is ideal and superior to this hack.
Jeff
Take that back. I checked the build and 2:2 does not work correctly with
highmem enabled. So
you may be correct. Highmem support is crap anyway and a 4:4 scheme is
what this should have been
from the start. It's ok. The nice thing about Linux if you don't like
what Linus is cooking in the kitchen,
you can add your own ingredients and make something else.
Jeff
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