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SubjectRe: page fault scalability patch v3: use cmpxchg, make rss atomic
On Mon, 23 Aug 2004, Christoph Lameter wrote:

> Issue remaining:
> - Figure out why performance drops for single thread.

Sorry, wrong baseline... There is no issue here except using a 2GB
test against a 4GB one.

Unpatched:
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
4 3 1 0.157s 11.197s 11.035s 69261.721 69239.940
4 3 2 0.145s 11.445s 6.079s 67849.528 115681.409
4 3 4 0.182s 13.894s 4.027s 55865.834 184108.856
4 3 8 0.196s 24.874s 4.025s 31369.039 184790.767

With page fault scalability patch:
Gb Rep Threads User System Wall flt/cpu/s fault/wsec
4 3 1 0.176s 11.323s 11.050s 68385.368 68345.055
4 3 2 0.174s 10.716s 5.096s 72205.329 131848.322
4 3 4 0.170s 10.694s 3.040s 72380.552 231128.569
4 3 8 0.177s 14.717s 2.064s 52796.567 297380.041
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