X z6001-z600 time with C-states >C1 disabled on both machines

It improves:

ping56          ~
ping1472        ~

TCP1             ~92μs  ->  ~89μs       (c -> c)
TCP1            ~120μs  ->  ~91μs       (c -> go)
TCP1            ~120μs  ->  ~90μs       (c <- c)
TCP1            ~120μs  ->  ~90μs       (go <- c)

TCP1472         ~220-250μs  -> ~180μs
TCP4096         ~270-300μs  -> ~220-230μs

ZEO:             ~750μs ->  ~660μs
NEO/pylite:      ~850μs ->  ~630μs      (Cpy)
NEO/pylite:      ~640μs ->  ~505μs      (Cgo)
NEO/pysql:      ~1500μs ->  ~930μs      (Cpy)
NEO/pysql:      ~1350μs ->  ~810μs      (Cgo)
NEO/go:          ~600μs ->  ~430μs      (Cpy)
NEO/go:          ~320μs ->  ~215μs      (Cgo)
NEO/go-nosha1:   ~260μs ->  ~195μs