Re: [PATCH] Convert pgtable cache to slab

David Mosberger
2005-02-15T20:03:22Z

>>>>> On Tue, 15 Feb 2005 13:59:45 -0600, Robin Holt <holt@sgi.com> said:

>> I certainly don't want to switch my machines to 4-levels. There
>> is zero need for that on the machines I use, so why pay the
>> overhead of an extra level?

Robin> I missed the why the extra level question. That part is
Robin> motivated by some large MPI jobs need a fourth level to get a
Robin> large enough single mapping to cover their entire dataset.
Robin> We have already tripped this limitation for a couple of our
Robin> really large customers.

What I'm saying is that the default probably should stay at 3-levels.
Optimizing ia64 linux _just_ for "really large customers" would be
a bad direction to go in.

--david