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In a related issue, It took our attention that whenever we run a rrul or rrul_var test, upload traffic seems to be absent.
Below examples were performed with two servers connected back-to-back with no router in between to rule out any blockage (they connect using an ethernet switch with ports in the same Vlan).
$ flent rrul_var -H 172.16.1.40 --test-parameter bidir_streams=6 --test-parameter markings=11,13,15,17,19,21
Summary of rrul_var test run from 2020-12-17 21:34:16.260047
Ping (ms) avg : 2.65 N/A ms 350
Ping (ms)::ICMP : 6.62 8.37 ms 350
Ping (ms)::UDP 0 (11) : 1.99 0.14 ms 350
Ping (ms)::UDP 1 (13) : 1.98 0.14 ms 350
Ping (ms)::UDP 2 (15) : 1.96 0.14 ms 350
Ping (ms)::UDP 3 (17) : 2.00 0.14 ms 350
Ping (ms)::UDP 4 (19) : 2.00 0.14 ms 350
Ping (ms)::UDP 5 (21) : 1.99 0.14 ms 350
TCP download avg : 156.53 N/A Mbits/s 350
TCP download sum : 939.18 N/A Mbits/s 350
TCP download::0 (11) : 190.43 171.36 Mbits/s 350 ---> OK
TCP download::1 (13) : 166.60 170.35 Mbits/s 350
TCP download::2 (15) : 143.99 156.95 Mbits/s 350
TCP download::3 (17) : 171.11 170.65 Mbits/s 350
TCP download::4 (19) : 110.92 94.05 Mbits/s 350
TCP download::5 (21) : 156.13 0.01 Mbits/s 350
TCP totals : 939.87 N/A Mbits/s 350
TCP upload avg : 0.12 N/A Mbits/s 350
TCP upload sum : 0.69 N/A Mbits/s 350
TCP upload::0 (11) : 0.19 0.18 Mbits/s 350 ---> No data
TCP upload::1 (13) : 0.10 0.17 Mbits/s 350
TCP upload::2 (15) : 0.04 0.07 Mbits/s 350
TCP upload::3 (17) : 0.14 0.13 Mbits/s 350
TCP upload::4 (19) : 0.09 0.13 Mbits/s 350
TCP upload::5 (21) : 0.13 0.14 Mbits/s 350
Now, if we run a tcp_12up test, we see upstream traffic:
Ping (ms) ICMP : 2.22 2.55 ms 350
TCP upload avg : 41.77 N/A Mbits/s 350
TCP upload sum : 501.25 N/A Mbits/s 350
TCP upload::1 : 38.43 38.24 Mbits/s 350
TCP upload::10 : 40.92 39.39 Mbits/s 350
TCP upload::11 : 42.97 41.55 Mbits/s 350
TCP upload::12 : 46.13 39.80 Mbits/s 350
TCP upload::2 : 46.77 44.63 Mbits/s 350
TCP upload::3 : 40.24 39.21 Mbits/s 350
TCP upload::4 : 40.75 40.54 Mbits/s 350
TCP upload::5 : 40.41 38.85 Mbits/s 350
TCP upload::6 : 42.30 40.38 Mbits/s 350
TCP upload::7 : 41.68 40.38 Mbits/s 350
TCP upload::8 : 40.70 39.47 Mbits/s 350
TCP upload::9 : 39.95 40.17 Mbits/s 350
Apparently, on bi-directional tests, upload traffic doesn't show, but if we run a Upsteram-only test, it works.
Traffic graphs on port connecting the servers show that indeed there is not Upstream traffic during testing.
Upload traffic must be present, otherwise how the second server is replying?
Is there any way to make upload traffic show up on rrul testing?
Thanks.
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