Build-time selection of AVX2 flags and routines is not practical for
distributions, but limiting AVX2 usage to checksum routines with
specific run-time detection doesn't allow for easy performance gains
from auto-vectorisation of batched packet handling routines.
For x86_64, build non-AVX2 and AVX2 binaries, and implement a simple
wrapper replacing the current executable with the AVX2 build if it's
available, and if AVX2 is supported by the current CPU.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
For demos, cool-retro-term(1) looked fancier, but several threads of
that and ffmpeg(1) are just messing up with performance testing.
The CI videos started getting really big as well, and they were
difficult to read.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
