On Fri, Oct 04, 2019 at 04:29:57PM +0200, Jason A. Donenfeld wrote: > On Fri, Oct 4, 2019 at 4:23 PM Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote: > > How is it relevant whether the boot CPU is A5 or A7? These are bL > > little cores that only implement NEON for feature parity with their bl > > big counterparts, but CPU intensive tasks are scheduled on big cores, > > where NEON performance is much better than scalar. > > Yea big-little might confuse things indeed. Though the performance > difference between the NEON code and the scalar code is not that huge, > and I suspect that big-little machines might benefit from > unconditionally using the scalar code, given that sometimes they might > wind up doing things on the little cores. > > Eric - what did you guys wind up doing on Android with the fast scalar > implementation? We're still just using the NEON implementation from the upstream kernel instead. - Eric
