You have to execute gen_sdbsyn.py before the synthesis. I hope later we can
automatize this by using hdlmake. Gitignore doesn't allow to commit
synthesis_descriptor.vhd because eveyone has to generate his/her own with the
script.

This way one Tx OOB word may be lost, and tx timestamp won't be generated
causing _wrn_start_xmit: descriptor overflow: tx timestamp pending_ message from
wr-nic driver

It reports the pstats version, number of counters stored in a single memory word
and the number of counters per each port. Information is then used by pstats
driver to create sysfs file used by SNMP for exporting counters values.