Hi there.
I want to share some findings... with default BBR v1 running in a ubuntu machine...
1. I started three separate flows/downloads in a terminal , each downloading 4 gb file
2. the border router is a 4G LTE device.
3. Linunx VM is running under windows 10 and is NATTED.
4. What i am experiencing right now that when i open browser in windows 10 and try to surf the browsing is very slow , it seems like BBR v1 flows in LINUX VM have choked the cubic flows.
root@ubuntu:/# ss -tin
State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
ESTAB 0 0
192.168.180.135:50394 152.199.19.160:443 bbr rto:204 rtt:0.222/0.077 ato:40 mss:1460 pmtu:1500 rcvmss:1460 advmss:1460 cwnd:14 bytes_sent:1228 bytes_acked:1229 bytes_received:506069209 segs_out:78946 segs_in:359574 data_segs_out:4 data_segs_in:359569 bbr:(bw:87819208bps,mrtt:0.133,pacing_gain:2.88672,cwnd_gain:2.88672) send 736576577bps lastsnd:671004 lastrcv:1496 lastack:1660 pacing_rate 1457628056bps delivery_rate 87819544bps delivered:5 app_limited retrans:0/1 rcv_rtt:14.951 rcv_space:2001709 rcv_ssthresh:3144640 minrtt:0.133
ESTAB 0 0
192.168.180.135:50390 152.199.19.160:443 bbr rto:984 rtt:210.063/192.905 ato:40 mss:1460 pmtu:1500 rcvmss:1400 advmss:1460 cwnd:14 bytes_sent:1228 bytes_acked:1229 bytes_received:660603501 segs_out:102315 segs_in:468896 data_segs_out:4 data_segs_in:468891 bbr:(bw:142438888bps,mrtt:0.082,pacing_gain:2.88672,cwnd_gain:2.88672) send 778433bps lastsnd:705704 lastrcv:280 lastack:308 pacing_rate 407069200bps delivery_rate 142439024bps delivered:5 app_limited rcv_rtt:1.708 rcv_space:631274 rcv_ssthresh:3144640 minrtt:0.082
ESTAB 0 0
192.168.180.135:50386 152.199.19.160:443 bbr rto:236 rtt:35.084/32.06 ato:40 mss:1460 pmtu:1500 rcvmss:1460 advmss:1460 cwnd:14 bytes_sent:1228 bytes_acked:1229 bytes_received:537402676 segs_out:85074 segs_in:381975 data_segs_out:4 data_segs_in:381970 bbr:(bw:77866592bps,mrtt:0.15,pacing_gain:2.88672,cwnd_gain:2.88672) send 4660814bps lastsnd:707992 lastrcv:32 lastack:120 pacing_rate 222531160bps delivery_rate 77866664bps delivered:5 app_limited busy:8ms rcv_rtt:22.969 rcv_space:2526712 rcv_ssthresh:3144640 minrtt:0.15