>>>>> On Thu, 24 Mar 2005 18:18:17 +1100, Nick Piggin <[EMAIL PROTECTED]> said:
Nick> After applying the recent freepgt patchset from Hugh (on
Nick> lkml), the time to fork+exit a process mapping 64GB of address
Nick> (32MB of page tables) is 0.471s. With the prefetch patch, this
Nick> drops to 0.357s.
Looks like a nice improvement to me.
Does prefetching 1 line ahead give the best results? That's only
128/8=16 PTEs. Assuming a 200 cycle latency, this would allow
for only 12.5 cycles/iteration. Especially for large (NUMA) machines,
prefetching further out might help more.
--david
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