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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