Is there an argument for lowering the default interval for when flent calls
irtt?
The default irtt packet length with no payload is 60 bytes, so here are
bitrates at various intervals for IPv4+Ethernet (106 byte frames, and tripled
for RRUL's three UDP flows):
```
200ms => 4.2 Kbit * 3 = 12.7 Kbit
100ms => 8.5 Kbit * 3 = 25.4 Kbit
50ms => 17.0 Kbit * 3 = 51 Kbit
20ms => 42.4 Kbit * 3 = 127.2 Kbit
10ms => 84.8 Kbit * 3 = 254.4 Kbit
```
50ms wouldn't be too disruptive in most cases. At 1 Mbit, the 5% of bandwidth
threshold is crossed.
Bitrates could also be lowered by ~15% (16 bytes per packet) by passing in
`--tstamp=midpoint` and sacrificing the server processing time stat.
I'd also like to see packet loss (up vs down separately) shown by default,
somehow. :)
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