Solved it, thx! Could you provide some informations how to fully uninstall the mlnx drivers? Using the script isn't an option due to the side-effects on proxmox. Using it will result in uninstalling some pve-critical packages.
Same problem here:
3-Node Setup (1114S-WN10RT) with
EPYC 7702p CPU
512GB RAM
2x 3.84TB WD SN630 U.2 SSD
Mellanox CX-6 100GbE Meshed Setup
Only getting 300-400 Mb/s write speeds at 4M BS in rados-bench after the latest updates. Raw speed of the drives are 1200 MB/s each. iperf shows 90 Gbit/s...