iperf3 Retr Retransmitted TCP Packets acceptable value

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mwrnd

New Member
Jul 5, 2022
25
18
3
I have a used dual 25GbE ConnectX-5 adapter and am seeing varying levels of Retransmits using a short Direct-Attach Cable or Active Optical Cable between the two interfaces. Values increase when the adapter gets hot.

Retr is 0 when using 1GbE modules and a 25m Fiber patch cable.

What value for iperf3 Retr would you consider a problem?

Innova-2_iperf3_Test.jpg
 
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