[rnrn]

It’s not a cargo cult if the actions directly cause cargo to arrive based on well understood mechanics.

Regardless of whether it would be better in some situations to align to 128 bytes, 64 bytes really is the cache line size on all common x86 cpus and it is a good idea to avoid threads modifying the same cacheline.

[Sesse__]

It indeed isn't, but I've seen my share of systems where nobody checked if cargo arrived. (The code was checked in without any benchmarks done, and after many years, it was found that the macros used were effectively no-ops :-) )