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Zerix

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  1. Zerix's post in Unraid 7.1.4 - iperf bidir asymmetry - TX = line speed, RX = 1/10 line speed, slow SMB transfers was marked as the answer   
    So this is ASPM related, maybe just my setup, maybe i226-LM. Not powertop or any tweaks (tested with a clean install) just OS controlled ASPM.

    This is a modern board so OS controlled ASPM is the default in the bios, thus the kernel allows L0s/L1 states. Apparently some of the ASPM states that the NIC advertises as supported don't work very well, at least not with my system combo.

    Disabling ASPM completely on just the NIC appears to have solved the issue, SMB copies are showing the full 113MB/s 1Gbe line rate, iperf bidir is still funky though.

    Given SCP worked before but SMB didn't this is probably a latency/timing thing messing with the way SMB specifically works.

    Potentially a BIOS, igc driver, NIC firmware update or other low level thing can fix it in the future but specifically disabling L0s/L1 bits fixes the issue for the moment (will test a little more).

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