+------------+
| |
+------------| tester |<-------------+
| | | |
| +------------+ |
| |
| +------------+ |
| | | |
+----------->| DUT |--------------+
| |
+------------+
Hey guys. in our scenario we have one DUT and one TRex traffic generator with following configurations.
# /etc/trex_cfg.yaml
- version: 2
interfaces: ['03:00.1', '05:00.1']
port_info:
- ip: 10.0.0.1
default_gw: 10.0.0.2
- ip: 10.0.0.5
default_gw: 10.0.0.6
platform:
master_thread_id: 0
latency_thread_id: 1
dual_if:
- socket: 0
threads: [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]
# cap2/dns.yaml
- duration : 10.0
generator :
distribution : "seq"
clients_start : "16.0.0.1"
clients_end : "16.0.1.255"
servers_start : "48.0.0.1"
servers_end : "48.0.0.255"
clients_per_gb : 201
min_clients : 101
dual_port_mask : "1.0.0.0"
tcp_aging : 1
udp_aging : 1
cap_info :
- name: cap2/dns.pcap
cps : 1.0
ipg : 10000
rtt : 10000
w : 1
In our case we run following command for creating traffic :
./t-rex-64 -f cap2/dns.yaml -d 10
We have two pair interfaces in tester and DUT and we turned them on. traffic generated and transferred from client to server but RX pkts are more that TX pkts! But why ? In wrong scenario we have packet drop, but in this case we have extra packets in server interface. We sent 18 pkts but received 92 pkts. How can I fix it ?
------------
opackets : 9
obytes : 837
ipackets : 51
ibytes : 3264
Tx : 363.39 bps
Cpu Utilization : 0.1 %
Platform_factor : 1.0
Total-Tx : 664.27 bps
Total-Rx : 4.54 Kbps
Total-PPS : 0.98 pps
Total-CPS : 0.49 cps
Expected-PPS : 2.00 pps
Expected-CPS : 1.00 cps
Expected-BPS : 1.36 Kbps
Active-flows : 0 Clients : 511 Socket-util : 0.0000 %
Open-flows : 9 Servers : 255 Socket : 0 Socket/Clients : 0.0
drop-rate : 0.00 bps
summary stats
--------------
Total-pkt-drop : 0 pkts
Warning : number of rx packets exceeds 101% of tx packets!
Total-tx-bytes : 1530 bytes
Total-tx-sw-bytes : 0 bytes
Total-rx-bytes : 5888 byte
Total-tx-pkt : 18 pkts
Total-rx-pkt : 92 pkts
Total-sw-tx-pkt : 0 pkts
Total-sw-err : 0 pkts
Total ARP sent : 4 pkts
Total ARP received : 2 pkts
For troubleshooting I used wireshark on DUT interfaces. right side is about server interface with 48.0.0.0/8 route and 10.0.0.6 ip and left side is about client interface with 16.0.0.0/8 route and 10.0.0.2 ip. Following picture is result of ./t-rex-64 -f cap2/dns.yaml -d 1 with following result.
summary stats
--------------
Total-pkt-drop : 0 pkts
Warning : number of rx packets exceeds 101% of tx packets!
Total-tx-bytes : 170 bytes
Total-tx-sw-bytes : 0 bytes
Total-rx-bytes : 512 byte
Total-tx-pkt : 2 pkts
Total-rx-pkt : 8 pkts
Total-sw-tx-pkt : 0 pkts
Total-sw-err : 0 pkts
Total ARP sent : 4 pkts
Total ARP received : 2 pkts
