Hi all,
I'm testing network connectivity (speed and reliability) on a OpenShift cluster 3.1. I do this with 2 pods, each based on iperf3 Docker image. First pod starts iperf3 as server, other one as iperf3 client with: iperf3 -c iperf3 -t 120 (iperf3 name of server pod). What I notice is high throughput but also big retransmission rates: eg. duration Transfer Bandwidth Retransmissions (TCP) 0.00-120.00 sec 214 GBytes 15.3 Gbits/sec 170478 If the pods are on 2 different nodes, the retransmission rate is smaller (as is throughput): duration Transfer Bandwidth Retransmissions (TCP) 0.00-120.00 sec 22.6 GBytes 1.62 Gbits/sec 3627 What I was wondering - what causes this higher retransmission rates ? (Mostly, it's a sign the are network problems but is it ?) (I did some other tests, like deploying the containers via the Docker daemon onto 1 server. And even on a local laptop with only Docker daemon installed - and I always saw these tcp retransmission rates...) Thanks in advance ! kind regards, Erik
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