I've been learning on my home lab for awhile, and use iperf to try to make sure the network is functioning properly and never really noticed the "retr" column as long as the speeds looked good, but someone recently told me that "with that many retries you should check your cables". Does anyone have a rule of thumb? If I move a 10G file at 9.4 Gbps is 2,737 retries of concern, for example?
I've tried looking in Google for an answer or rule of thumb but haven't found anything seemed well-reasoned.
root@svr-03:~# iperf3 -c 192.168.100.11 Connecting to host 192.168.100.11, port 5201 [ 5] local 192.168.100.13 port 41870 connected to 192.168.100.11 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 1.10 GBytes 9.43 Gbits/sec 0 1.39 MBytes [ 5] 1.00-2.00 sec 1.09 GBytes 9.40 Gbits/sec 548 1.20 MBytes [ 5] 2.00-3.00 sec 1.09 GBytes 9.39 Gbits/sec 628 576 KBytes [ 5] 3.00-4.00 sec 1.09 GBytes 9.39 Gbits/sec 1201 1.16 MBytes [ 5] 4.00-5.00 sec 1.09 GBytes 9.40 Gbits/sec 360 1.17 MBytes [ 5] 5.00-6.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.20 MBytes [ 5] 6.00-7.00 sec 1.10 GBytes 9.41 Gbits/sec 0 1.24 MBytes [ 5] 7.00-8.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.26 MBytes [ 5] 8.00-9.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.27 MBytes [ 5] 9.00-10.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.28 MBytes
[ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 11.0 GBytes 9.41 Gbits/sec 2737 sender [ 5] 0.00-10.04 sec 10.9 GBytes 9.37 Gbits/sec receiver
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