Re: [tbench regression fixes]: digging out smelly deadmen.

Mike Galbraith
2008-10-26T09:16:08Z

On Sun, 2008-10-26 at 10:00 +0100, Peter Zijlstra wrote:
> On Sun, 2008-10-26 at 09:46 +0100, Mike Galbraith wrote:

> > 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