X neo1-neo2 time with C-states >C1 (and RX delay) disabled on both machines

Compared to no C-states disabled (but RX delay = 0 as before) it improves:

ping56            36μs  ->    33μs
ping1472        ~150μs  ->  ~107μs

TCP1             ~65μs  ->   ~45μs
TCP1472     ~440-515μs  ->  ~420μs    (still very bad)
TCP4096         ~370μs  ->  ~280μs    (still bad)

ZEO:            ~900μs  ->  ~670μs
NEO/pylite:    ~1050μs  ->  ~600μs    (Cpy)
NEO/pylite:     ~800μs  ->  ~505μs    (Cgo)
NEO/pysql:     ~1700μs  ->  ~900μs    (Cpy)
NEO/pysql:     ~1300μs  ->  ~790μs    (Cgo)
NEO/go:         ~730μs  ->  ~430μs    (Cpy)
NEO/go:         ~370μs  ->  ~210μs    (Cgo)
NEO/go-nosha1:  ~280μs  ->  ~190μs

Raw TCP timings are still bad.