* Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> So because I did not have an old-glibc system like David's, I
> did not know the actual page fault rate. If it is high enough
> then nonlinear effects might cause such effects.
>
> This is an entirely valid line of inquiry IMO.
Btw., when comparing against 'mainline' I routinely use a
vanilla kernel that has the same optimization applied. (first I
make sure it's not a regression to vanilla.)
I do that to factor out the linear component of the independent
speedup: it would not be valid to compare vanilla against
numa/core+optimization, but the comparison has to be:
vanilla + optimization
vs.
numa/core + optimization
I did that with last night's numbers as well.
So any of this can only address a regression if a non-linear
factor is in play.
Since I have no direct access to a regressing system I have to
work with the theories that I can think of: one had a larger
effect, the other had a smaller effect, the third one had no
effect on David's system.
How would you have done it instead?
Thanks,
Ingo
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