Forcing full duplex with auto negotiation disabled will cause the switch at the the other end of the link to assume half duplex, this will cause a duplex mismatch causing extremely poor performance in one direction.
Repeat the test with half duplex and it should be fine in both directions:
ethtool -s eth0 speed 100 duplex half autoneg off
Never force full duplex with auto-negotiation off at one end of the link without also simultaneously forcing full duplex at the remote end. If you donāt have control of the configuration of the other end of the link, always use half duplex when disabling auto-negotiation.
Means next to nothing to me, Iām afraid. I just typed in what the dude above asked, in the hope of fixing it. Turns out Iām not alone, and thereās a number of people with the same issue.
If you fancy telling me what it should be set to, so I can ensure it is back to normal, that would be helpful.
Iāve spent more time messing with this network stuff than I did building my previous box from scratch.
yup gotta agree with @DBMandrake (is that an old distro or wizard reference?) that forcing 1000mb full duplex rarely works on linux - better to let it autoneg or youāll end up with 10/half
My issue is that the Vero 4K+ is not negotiating a gigabit connection to my switch. I have tried different ethernet cables and two different gigabit switches:
Ubiquiti UniFi US-8-150W (managed, port link negotiation set to auto)
I set the UniFi switch port 4 to 1000/full duplex and did the same for vero 4k+ with ethtool -s eth0 speed 1000 duplex full. Vero 4k+ fails to get any link to both the HP switch (which is unmanaged, cannot configure it) and the UniFi switch. UniFi switch port 4 ā HP switch gives a gigabit link.
Yes, it was the same cable. Iām also out of ideas, Iāve tried three different cables and now three different switches (last one was Asus RT-AC66U router/switch, same problem).
I have an Asus RT-AC68U in AP mode. I know yours is an AC66U, but stillā¦ If I get a moment today Iāll set up my second Vero 4K+ directly connected to that, and report my iperf results if thatāll help?
For me the issue is that I donāt even have a gigabit ethernet connection between my switch and the vero 4k+. Link speed is 100Mbit/s so thatās the fastest speed I could get, havenāt really done any performance tests before my link speed is 1Gbit/s.
I suspect there could be something wrong with my Vero 4K+ unit.
Iāve tested three different gigabit switches and cables. Seems unlikely that itās related to either of those, different switch manufacturers and bought years apart from each other (HP is 10 years old, Asus router is 5 years old and the Ubiquiti Unifi is brand new). I donāt think Iāve ever had this kind of problem with a gigabit ethernet device before, usually they just work ā¢.
I donāt have access to another Vero 4K+ so I canāt rule out that this unit is faulty.
Whatās the next step, the test kernel you mentioned?