Virtual Bridge Models

[Midgardlol]

Hi,

I have a X710 intel card on my hypervisor Proxmox and 10Gbits network,
but i can't set 10Gbits on my VM only 1Gbits.

X710 Intel Models does not seem correctly configure.

Is there à X710 drivers for virtual bridge on machines ?

Laurent

 

[aaron]

What NIC model did you configure in your VM? E1000 or VirtIO?
The bridge itself is the virtual switch, connecting your physical network with your VMs.

How fast your VM thinks the network is, depends on the NIC model. But since these are all virtual NICs, that is just a number. The actual speed, especially between two VMs, will mainly be limited by what your server can handle.

Did you do a speed test between another machine and the VM for example with iperf?

 

[Midgardlol]

I choose VirtIO, ethtool says unknown for speed,
with E1000 says 1Gbits and Realtec says 100Mbits,.
never 10Gbits

My Proxmox hypervisor is 10Gbits

I do a speetest, it gives me about 1Gbits, but it can be the trafic shaping on the line
or sonething else, so i test ethtool ...

root@ganesha:~ > iperf -c 10.1.1.1 -u -b 10G
------------------------------------------------------------
Client connecting to 10.1.1.1, UDP port 5001
Sending 1470 byte datagrams, IPG target: 1.10 us (kalman adjust)
UDP buffer size: 208 KByte (default)
------------------------------------------------------------
[ 3] local 10.10.5.110 port 48258 connected with 10.1.1.1 port 5001
[ 3] WARNING: did not receive ack of last datagram after 10 tries.
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 2.25 GBytes 1.94 Gbits/sec
[ 3] Sent 1645511 datagrams
root@ganesha:~ >

 

[aaron]

I do a speetest, it gives me about 1Gbits, but it can be the trafic shaping on the line
or sonething else, so i test ethtool ...

Is the server in your own network where you can attach another 10Gbit machine via a 10Gbit switch or directly?

Well, if you want to test it, you will need another machine that is connected to your server with 10Gbit.

Again, numbers reported by any tools on how fast the NIC is, cannot be trusted, as it is not real hardware on the VM side.

[ ID] Interval    Transfer    Bandwidth
[ 3] 0.0-10.0 sec 2.25 GBytes 1.94 Gbits/sec

This definitely looks faster than 1Gbit. Without more details on the actual physical network, it is hard to say more

 

[spirit]

with iperf, you can try to increase window size, or increase number of threads.
The main limit of virtio nic is more pps (around 1millions pps by core/thread), than bandwith.

 

[Midgardlol]

Hypervisor says 7 Gbits, why VM less ?

root@uatu:~ > iperf -c 10.1.1.1 -u -b 10G
------------------------------------------------------------
Client connecting to 10.1.1.1, UDP port 5001
Sending 1470 byte datagrams, IPG target: 1.10 us (kalman adjust)
UDP buffer size: 208 KByte (default)
------------------------------------------------------------
[ 3] local 10.10.5.100 port 33246 connected with 10.1.1.1 port 5001
[ 3] WARNING: did not receive ack of last datagram after 10 tries.
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 8.38 GBytes 7.20 Gbits/sec
[ 3] Sent 6122711 datagrams
root@uatu:~ >

 

[Midgardlol]

Same differences with a real 10Gbits machine :
7.20 Gbits on hypervisor
1.9 Gbits on the VM

?