High retransmisions in VMs but no retransmision on pve node

pablomart81

Active Member
Dec 9, 2020
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Hello everyone,

We have been doing some network testing on our VMs because of a recent network change we have made. While doing this test we have noticed a high retransmission rate on our VMs, between nodes. This doesn't happen when VM's are on the same node, or when we test between 2 pve nodes. These are the test we did with iperf3

Testing iperf3 between 2 VM on different pve nodes
1733838045547.png
Testing iperf3 between 2 VM on same pve node
1733838205036.png
Testing iperf3 between 2 pve nodes
1733838125941.png

Has this happened to any of you? Maybe there's something we didn't install in our proxmox environment or in the VMs.

Everything works fine and network speeds are high, but we'd like to fix the retransmission problem to improve it.

Any help would be welcome

Thanks in advance
 

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