Comment 3 for bug 1845018

Yeah, on eoan I get:
$ cat /proc/spl/kstat/zfs/fletcher_4_bench
0 0 0x01 -1 0 4250112835 2191051355493
implementation native byteswap
scalar 7121128976 5682673600
superscalar 9132158207 6984205638
superscalar4 8279361738 6770847284
fastest superscalar superscalar

The same machine on bionic gets:
0 0 0x01 -1 0 67628130770 127422129063
implementation native byteswap
scalar 7105261516 5016484387
superscalar 9725496554 7224297957
superscalar4 8153749237 6904111964
sse2 16325929140 9147142980
ssse3 16010951957 14542922899
avx2 24379617040 23016231817
fastest avx2 avx2

Bionic's algorithm using avx2 is 2.6x faster.