Re: page fault scalability patch v3: use cmpxchg, make rss atomic

[Christoph Lameter]

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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