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So to mark this as resolved, seems there is an network hardware level issue. Iperf is find one way, but complete poo the other. There is something up with either the 2.5g adapter or the 10g base-t transceiver.

Been happy with unraid for some time on gigabit Ethernet with throughput that is saturating gigabit connection. Recently bought a couple of 10g cards to try out in the server which has drastically slowed down SMB (~250mbit). Iperf3 is showing full throughput to a windows machine. Machine has a 2.5g USB adapter that is connected over Ethernet to a 10g switch. Server is connected via DAC cable to the switch. 10g cards used in the server is a melenox connect x2 and QLogic Corp. cLOM8214 on a true x8 pcie port. Things iv'e tried: Iperf test Removed the bonded connection, where the 10g connection is not bonded to anything else Set the MTU to 9000. Is it configuration error, hardware, or a bug?