Hey Dan,

On Fri, Oct 05, 2018 at 03:05:38PM -0000, D. J. Bernstein wrote:

Of course, there are other ARM microarchitectures, and there are many
cases where different microarchitectures prefer different optimizations.
The kernel already has boot-time benchmarks for different optimizations
for raid6, and should do the same for crypto code, so that implementors
can focus on each microarchitecture separately rather than living in the
barbaric world of having to choose which CPUs to favor.

I've been playing a bit with some code to do this sort of thing,
choosing a set of implementations to enable or disable by trying all the
combinations, and then calculating a quick median. I don't know if I'll
submit that for the initial merge of this patchset -- and in fact all
the current implementations I'm proposing are pretty much okay on
microarchitectures -- but down the line this could be useful as a
mechanism.

Jason
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