On Sun, 2008-10-26 at 10:00 +0100, Peter Zijlstra wrote:

On Sun, 2008-10-26 at 09:46 +0100, Mike Galbraith wrote: 

quoted

I reproduced this on my Q6600 box.  However, I also reproduced it with
2.6.22.19.  What I think you're seeing is just dbench creating a
massive train wreck. 

wasn't dbench one of those non-benchmarks that thrives on randomness and
unfairness?

Andrew said recently:
  "dbench is pretty chaotic and it could be that a good change causes
dbench to get worse.  That's happened plenty of times in the past."

So I'm not inclined to worry too much about dbench in any way shape or
form.

Yeah, I was just curious.  The switch rate of dbench isn't high enough
for math to be an issue, so I wondered how the heck CFS could be such a
huge problem for this load.  Looks to me like all the math in the
_world_ couldn't hurt.. or help.

	-Mike