Krait gets all this praise for being so power efficient but I have yet to see a real comparison with normalized
> performance on the same process and all that. All I've seen is comparisons where A15 uses more power (sometimes
> a lot more) while also performing better (sometimes a lot better).

Not on any vector workloads. The A15 had some terrible behavior when doing SIMD.

I repeat it constantly, but perf/W is
> not linear and these comparisons are meaningless. Reduce the clock speed on the A15 until it matches the
> performance on the Krait core and then do a fair measurement - of course, this will vary tremendously from
> benchmark to benchmark, especially since Krait appears to have some big glass jaws.

What do you think the glass jaws of Krait are?

> What we do know is this: despite your remarks that power management is "not so strong" in A57 Qualcomm
> still preferred to use it instead of a version of Krait that only added ARMv8 support, something
> I'm sure they could have done in time if it would have given them such an advantage.

I don't think so. I believe Qualcomm is only using ARM cores for their APs due to time to market constraints.

David