/proc/net/dev counts octets; the field is named rx_bps, vvFmtBps renders Kb/s
and Mb/s, and the Monitor card prints it directly under the NIC link speed from
/sys/class/net/*/speed, which genuinely is megabits. So the one figure you would
read against the link understated traffic eightfold — 811 KB/s shown as "0.8
Mb/s" beside a 10 Gb/s link when it was 6.5. Converted at the source so the
field name stops lying; both consumers are bit-labelled or relative.