1. L

    Mellanox Connect-X 5 weird performance issues over MPLS

    I feel like I need to give a bit of background here. We have two locations, one in Atlanta and one in Dallas. We have an MPLS connection between the two sites and redundant internet connection to separate firewalls and separate switches in both locations. The main focus is the MPLS connection...
  2. C

    PVE Networking stuck at 1Gb/s with 10Gb link

    Hi, I have a probleme with my proxmox cluster, I have a bond for CEPH derectly connected betwen the nodes in 10Gb and a bond for public network with 10Gb link to. But when i do an iperf with public network I have my 10Gb/s but not with my CEPH network. Before this configuration I haved...
  3. G

    Proxmox fluctuation in Network Speed via Iperf

    I got an issue since a while that the network connection speed drops on my Proxmox. (I check it with Iperf3) I have an 2.5 Gbit connection but sometimes the speed drops to 1 Gbit or sometimes even 100 Mbit. The clue is. I get this resolved 99% of the time when I change the MTU in the GUI from...
  4. Z

    Iperf3 @ 10GB/s! However, SCP Speed at 1GB/s ??!!

    Hi, I have a DEBIAN (11) and CentOS 7 VM. The host Proxmox PVE has a 10GB ethernet and I'm using OpenVswitch (OVS Bridge, OVS Port and OVS intPort). All the VMs are running VirtIO drivers for their NIC On my Debian and CentOS VM's, SCP transfers between VM's are only going at 1GBs and...
  5. L

    Mellanox ConnectX-6 Dx - full mesh - slow into VM

    Hi there I have 3 Proxmox nodes Supermicro SYS-120C-TN10R connected via Mellanox 100GbE ConnectX-6 Dx cards in cross-connect mode using MCP1600-C00AE30N DAC Cable Ethernet 100GbE QSFP28 0.5m # lspci -vv -s 98:00.0 98:00.0 Ethernet controller: Mellanox Technologies MT2892 Family [ConnectX-6...
  6. D

    strange vm network speed issue

    Hi, I have a strange issue with my network on Proxmox 7. When I use iperf between a connected PC and the Proxmox host, I get around 920-945 mbit/s. Between the Proxmox host and a linux VM, I get 3-7 gbit/s. (everything correct so far) But between the connected PC and the linux VM, i get only...
  7. J

    VMs not running on full Gigabit speeds?

    Hello all, I ran some iperf tests from my desktop to the proxmox VMs and in between VMs and the tests are not as I expected. iperf test from Fedora workstation to proxmox physical Nic is close to gigabit Client connecting to, TCP port 5001 TCP window size: 0.08 MByte (default)...


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