Re: [PATCH] Convert pgtable cache to slab

David Mosberger
2005-02-15T20:26:23Z

>>>>> On Tue, 15 Feb 2005 12:15:19 -0800, William Lee Irwin III <wli@holomorphy.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? 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... ;-)

--david