c1
--

+ ip tcp_metrics show
10.4.0.67 age 77.649sec cwnd 10 rtt 4121us rttvar 5745us source 10.4.0.50
10.4.0.66 age 0.040sec cwnd 18 rtt 3388us rttvar 5127us source 10.4.0.50
192.168.119.82 age 12.296sec ssthresh 5 cwnd 10 rtt 15767us rttvar 11144us source 192.168.115.50
10.4.0.50 age 77.882sec cwnd 10 rtt 2054us rttvar 3157us source 10.4.0.50
10.4.0.82 age 0.309sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 77.919sec cwnd 10 rtt 1746us rttvar 3058us source 10.4.0.82
192.168.115.50 age 12.187sec cwnd 10 rtt 10886us rttvar 6241us source 192.168.119.82


m1
--

+ iptables -t mangle -L POSTROUTING -n
Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
TOS        tcp  --  0.0.0.0/0            0.0.0.0/0            tcp flags:!0x17/0x02 DSCP match 0x01 TOS set 0x01/0xff


m2
--

+ tc -s -d qdisc show dev ens192
qdisc cake 1: root refcnt 2 bandwidth 50Mbit besteffort flows nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0 sce 
 Sent 8919056 bytes 134420 pkt (dropped 0, overlimits 369 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 2176b of 4Mb
 capacity estimate: 50Mbit
 min/max network layer size:           42 /     722
 min/max overhead-adjusted size:       42 /     722
 average network hdr offset:           14

                  Tin 0
  thresh         50Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay          2us
  av_delay          1us
  sp_delay          1us
  backlog            0b
  pkts           134420
  bytes         8919056
  way_inds            0
  way_miss            6
  way_cols            0
  sce                 0
  marks               0
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len           722
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 356619658 bytes 243462 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ens224
qdisc cake 1: root refcnt 2 bandwidth 50Mbit besteffort flows nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0 sce 
 Sent 366584050 bytes 243461 pkt (dropped 0, overlimits 348590 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 164952b of 4Mb
 capacity estimate: 50Mbit
 min/max network layer size:           42 /    1514
 min/max overhead-adjusted size:       42 /    1514
 average network hdr offset:           14

                  Tin 0
  thresh         50Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay        4.7ms
  av_delay        3.9ms
  sp_delay          2us
  backlog            0b
  pkts           243461
  bytes       366584050
  way_inds            0
  way_miss            6
  way_cols            0
  sce            105716
  marks             114
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         10598
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 7037220 bytes 134419 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000 delay 5.0ms
 Sent 366584532 bytes 243467 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ifb4ens224
qdisc netem 1: root refcnt 2 limit 1000000 delay 5.0ms
 Sent 8919436 bytes 134424 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0