Re: [PATCH] Convert pgtable cache to slab

From: David Mosberger <>
Date: 2005-02-16 07:03:22
>>>>> On Tue, 15 Feb 2005 13:59:45 -0600, Robin Holt <> 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.

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Received on Tue Feb 15 15:06:11 2005

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