--channel-bandwidth-downstream affects sender

[timofey-barmin]

When I add --channel-bandwidth-downstream option not only receiving side gets blocked but the sender as well.
Example:

server side

$ tcpkali -l 8839  -T '15m' --dump-all --listen-mode=active -m "**********" -r 1
Listen on: [0.0.0.0]:8839
Snd(233, 10): [**********]
Rcv(233, 10): [@@@@@@@@@@]
Snd(233, 10): [**********]
Rcv(233, 10): [@@@@@@@@@@]
Snd(233, 10): [**********]
Rcv(233, 10): [@@@@@@@@@@]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
Snd(233, 10): [**********]
//... keeps sending ...

client side

tcpkali -m "@@@@@@@@@@"  -c 1 -T '15m' -r 1 --dump-all  --channel-bandwidth-downstream '5Bps' localhost:8839 --nagle=on
Destination: [127.0.0.1]:8839
Destination: [127.0.0.1]:8839
Interface lo address [127.0.0.1]:0
Using interface lo to connect to [127.0.0.1]:8839
Using interface lo to connect to [127.0.0.1]:8839
Ramped up to 1 connections.
Rcv(12, 10): [**********]
Snd(12, 10): [@@@@@@@@@@]
Snd(12, 10): [@@@@@@@@@@]
Rcv(12, 20): [********************]
Snd(12, 10): [@@@@@@@@@@]
🕐  Traffic 0.000↓, 0.000↑ Mbps (conns 0↓ 1↑ 0⇡; seen 1)

//... sends nothing more (but it should)...