The network:

- improves much for ping (ethernet drivers are patched https://marc.info/?l=linux-netdev&m=150654466102277&w=2)
- becomes _worse_ for 1B, 1472B TCP pings
- becomes better for 4K TCP pings

The time for ZEO and NEO/* imrpoves by 100-200μs.

It has to be understood what happens with TCP and then maybe other
timings will improve more.