The network cards do not reach the expected speed.

[alexander.harms]

In our PVE cluster, we use 100G network cards. Three servers have Intel cards, while the others have Broadcom 100G cards. The Proxmox Backup Server has the same hardware and 100G Intel cards.
When I run a test with iperf within the cluster, I get 21 Gbit/s.
The backup server achieves 65 Gbit/s. We have already loaded the manufacturer’s modules for the cards, but without improvement.
Has any one have the same problem?

 

[waltar]

You cannot reach bw limit with single stream of data. There's a) some option to iperf to run in multiple streams or b) do multiple transfers or real data between your hosts to test your 100Gb.