Very poor networking performance

[roghan]

Hi,
I installed the latest Proxmox release (3.4-6) on an Intel server, and I tried to configure a Linux bond. However, I get very poor networking performance and I'm not able to find out the issue! I have problems to connect to the only one Windows VM via RDP (also with VIRTIO driver installed) since the RDP connection often drops/hangs, and the iperf tool shows very bad values:

Server listening on TCP port 2001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.10.10.18 port 2001 connected with 10.10.10.138 port 52567
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-22.7 sec   640 KBytes   231 Kbits/sec

when other servers on same subnet/segment have more or less these values:

[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   816 MBytes   685 Mbits/sec

I tried to change the bond mode from balancerr to actvice-backup with no performance change, and the network config is this one:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual

auto eth1
iface eth1 inet manual

auto bond0
iface bond0 inet manual
        slaves eth0 eth1
        bond_miimon 100
        bond_mode active-backup

auto vmbr0
iface vmbr0 inet static
        address  10.10.10.18
        netmask  255.255.255.0
        gateway  10.10.10.1
        bridge_ports bond0
        bridge_stp off
        bridge_fd 0

Do you have any suggestion? It's impossible to work in this way .

Thanks in advance!!

 

[manu]

For this kind of issues I would start maybe with a Linux live CD with a different kernel ( Debian is fine for instance), and run the iperf test again from there, to first get sure it's not a NIC/switch problem.

 

[roghan]

For this kind of issues I would start maybe with a Linux live CD with a different kernel ( Debian is fine for instance), and run the iperf test again from there, to first get sure it's not a NIC/switch problem.

manu, thank you for you suggestion! In fact, I found out the problem was a saturated switch that slowed down all connected devices and the Proxmox node itself. I solved my issue ...