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Why am I seeing overlimits in TC statistics?

fr flag

I configured my linux servers with tc (TBF) using the below parameters:

rate 1Gbit burst 1000Kb lat 200.0ms

Now, when I'm testing Iperf between this server and another server as iperf client, I'm getting on my server around 273 Mbits/sec, probably because of distance and other challenges. If I'm deleting the tc adjustments I'm getting the same bandwidth.

But here is my problem - When I check the tc statistics tc -s qdisc ls dev eth0 I'm getting the below results:

qdisc tbf 2: root refcnt 2 rate 1Gbit burst 1000Kb lat 200.0ms
 Sent 1525069621 bytes 15593 pkt (dropped 0, overlimits 2849 requeues 0)
 backlog 0b 0p requeues 0

I don't understand why I see overlimits. I would expect to see overlimits only if the bandwidth would be more than 1G, and then the shaping part would take place. But if the actual bandwidth is around a third of my limit, why am I getting overlimits?

What am I missing?

mangohost

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