Re: [PATCH] Convert pgtable cache to slab

From: David Mosberger <>
Date: 2005-02-16 07:26:23
>>>>> On Tue, 15 Feb 2005 12:15:19 -0800, William Lee Irwin III <> 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?  BTW: why do you want 4-level/16KB
  >> over 3-level/64KB?

  William> It may be worth noticing that things like fault latency and
  William> small writes degrade with increased pagesize, though I seem
  William> to recall hearing that this effect was less pronounced or
  William> did not set in at 64KB on ia64.

Certainly, but fault-latency also increase with the number of levels.
And there are real customers who care about page-fault latency a lot
which run apps where the probability of the page-table entries being
in the cache is close to zero...

I'm not advocating one over the other --- I'm pro choice... ;-)

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Received on Tue Feb 15 15:27:56 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:35 EST