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I recently added a 10gb NIC to my server. It has two SFP+ ports so I am using one for unraid and the other for a windows VM. They are both connected to a Unifi 10Gbe switch. However when I run iperf I am only getting transfers of 1.5Gbps. If I attempt to pull a file from the server to another computer it reduces the transfer rate from the other computer. I have increased the MTU to 9000 in unraid. And both connections register as 10Gbe via unraid and windows. Any help with this would be appreciated.

 
 
UPDATE:
So, I have tried everything I can think of. Force 10Gbe connection on switch. I have made sure my connection is not bonded. Changed the MTU to 9000. I am on the same network, same subnet. I have enabled tuneable(direct i/o). What is also strange is, the connection is faster with the windows client as the iperf server. When using unraid as the iperf server the connection is about half.

 
 
UPDATE 2:
 
Problem was the VM. I tested via another computer and speeds were fine. I ended up adding a 2nd NIC and just passing through to VM. All good now. It didn't like me passing a single SFP+ port from my primary card. Could just be the model but either way. All good now.

You need to change the adapter setting for eth2 to eth0 so unraid uses it. If you go to setting->network setting you should see the below settings. Change the NIC Mac for eth2 to eth0 and reboot. Unraid will then use your 10Gb connection.