Re: [PATCH] Convert pgtable cache to slab

William Lee Irwin III
2005-02-15T20:15:19Z

On Tue, 15 Feb 2005 13:31:48 -0600, Robin Holt <holt@sgi.com> said:
Robin> Is there a strong objection to implementing 4 levels of 16k
Robin> page tables for now and then, if someone else sees a need,
Robin> convert to using long page table format and adjust page
Robin> tables as needed at that point in time.

On Tue, Feb 15, 2005 at 11:46:21AM -0800, David Mosberger wrote:
> 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?

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

-- wli