Cannot get speeds of 10 GB between VM

Hi, I have 2 ESX hosts with 10 GB in them cards. I have a vSwitch configured with added network cards, they all show 10000 full. The physical switch shows connected to 10 GB as well

I added 2 VM with vmxnet3 NIC on the same host for the Group of ports. Inside the virtual machine, I see vmxnet3 Ethernet adapters in both, and they all have both connected at the speed of 10 GB watch.

However, if I take a 3 GB file and copy it from the virtual machine, there are anywhere from 30 to 50 seconds, which puts my speed to something like 480-800Mbps, obviously far 10 Gbps.

I should also mention that there is almost no other traffic on the ESX host, he is still in the test phase was then only a handful of VM on it.

Can anyone suggest what I could have done wrong? I thought when I saw that the NETWORK adapter that is connected to 10 Gbit/s inside the virtual machine as everything was hunky dory, but these speeds suuuuck.

Iperf on Windows doesn't work very well in general, the results seem good enough about that already. You can play with the settings a little more until you have reached a sweet spot, but it's hard to say. Try -p 10 and w 65536 for several parallel sessions and TCP window size increased.

Also make sure that the VMs system you use for the test have enough vCPUs to handle the load that you push through the virtual wires. Jumbo frames could surely also come in handy.

Tags: VMware

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