Problems with 10Gbps on Windows Virtio Adapter?

[marciglesias17]

Hello,

I have a Proxmox server connected to 2x10Gbps ports with Bond, I install a Debian machine with a Virtio adapter and it gives me 10Gbps internet speed, when I install a VM with Windows 10 or Windows Server 2019, with a Virtio adapter, I install the drivers and then Do a speed test, it only gives me 1Gbps, any recommendation to have 10Gbps in my Windows?

Thanks,

 

[tom]

How do you test the speed inside your VMs?

 

[marciglesias17]

From speedtest, to a closer server, the same server in both operating systems

 

[tom]

are you sure that the tool can handle such speeds correctly on windows?

I remember that I had problems with iperf on windows.

 

[marciglesias17]

I have tried to do a test from a Ubuntu VM in the same proxmox with iperf3, from Ubuntu to Windows, but I do not receive 10Gbps, i get 2gbps

 

[tom]

I assume your problem is not the network speed, its the benchmark tool.

Before testing VM to VM, start with a host to VM test first.

 

[spirit]

do you have tried to enable multiqueue on the nic, and try iperf with (-P xxx).

also, try to compare between iperf2 / iperf3. (iperf2 use multiple core vs iperf3 only 1 core)

also try with different packet size, if I remember virtio-net is able to handle around 800000 packets/s by core. (so multiqueue is important here)