Nick's scheduler v17
From: Nick Piggin
Date: Fri Oct 24 2003 - 13:11:57 EST
Hi,
http://www.kerneltrap.org/~npiggin/v17/
Still working on SMP and NUMA. Some (maybe) interesting things I put in are
- Sequential CPU balancing so you don't get a big storm of balances
every 1/4s.
- Balancing is trying to err more on the side of caution, I have to start
analysing it more thoroughly though.
- Attacked the NUMA balancing code. There should now be less buslocked ops /
cache pingpongs in some fastpaths. Volanomark likes it, more realistic
loads
won't improve so much http://www.kerneltrap.org/~npiggin/v17/volano.png
This improvement is NUMA only.
I haven't had time to reproduce Cliff's serious reaim performance
dropoffs so
they're probably still there. I couldn't reproduce Martin's kernbench
dropoff,
but the 16-way I'm using only has 512K cache which might not show it up.
-
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