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H2/H3: "old problem" Link (eth0) is Up/Down syndrom


guidol
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Armbianmonitor:

on a Sunvell R69 (H2) and a NanoPi Neo (H3) I got these "old known" eth0 Link Up/Down syndrom, but couldnt find a solution in the forum while using the search-engine :(

 

armbianmonitor -u
System diagnosis information will now be uploaded to

Sunvell R69 - Linux sunvell-r69 5.4.0-rc8-sunxi #19.11.3 SMP Wed Nov 27 17:01:29 CET 2019 armv7l armv7l armv7l GNU/Linux : 

http://ix.io/232T

 

NanoPi Neo - Linux npi-neo 5.3.3-sunxi #5.98 SMP Sat Oct 5 18:34:15 +03 2019 armv7l GNU/Linux :

http://ix.io/232U


in dmesg it looks like
 

[10536.264427] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[10568.008879] dwmac-sun8i 1c30000.ethernet eth0: Link is Down
[10571.081067] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[10575.177000] dwmac-sun8i 1c30000.ethernet eth0: Link is Down
[10580.297247] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[10604.873552] dwmac-sun8i 1c30000.ethernet eth0: Link is Down
[10607.945753] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[10608.969632] dwmac-sun8i 1c30000.ethernet eth0: Link is Down
[10612.041827] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[10631.498029] dwmac-sun8i 1c30000.ethernet eth0: Link is Down
[10633.546213] dwmac-sun8i 1c30000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[10636.618141] dwmac-sun8i 1c30000.ethernet eth0: Link is Down

I have the feeling its could have to do with using 1GBit/1000MBit devices on the same 100MBit-Ethernet-Hub, because I do get much mor of these messages when my armbian-build-system-PC is on (which uses a onboard GBit-Ethernet-Card).
On the 100MBit-Hub there are also some othe 1GBit-Devices like the NanoPi Neo2.

On the PC I did try to force the 1GBit-Card to 100MBit with ethtool -s eth0 speed 100 autoneg off 

But that doesnt seem to help.

 

On other SBC-devices I could find these messages in the dmesg (and in the froum search it was a problem 4 to 2 years ago)

 

On the other hand there was a disscussion about a new driver version for kernel 4.1.4 at
https://forum.armbian.com/topic/4364-dwmac-sun8i- driver-v6/

 

 

With debian stretch armabian 5.41 and kernel 4.1.4.34 I did see that problem (and doenst feel it at a SSH-session) on the Sunvell R69. 

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For those who end up here via search engines:

 

On a NanoPI M4V2 (RK3399) I activated the `tuned` profile "latency-performance" for my use case without the intention to address this issue. Thus, by coincidence, I recognized that the issue apparently disappeared (or got a lot less frequent, at least, since it hasn't appeared in the last 12 hours). I don't have the time/priority to track down which of the settings actually helped but it should be the governor or cstate settings.

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Thank you @lpirlfor your tip, unfortunately it did not work on my Orange Pi PC (H3 CPU), running Armbian 22.05.1 Bullseye with Linux 5.15.43-sunxi.

Here is what I tried (as root) :

apt install tuned tuned-utils tuned-utils-systemtap
tuned-adm profile latency-performance
reboot

 

It happens since I changed my ISP (and the router they provide). I tried all ethernet ports, but unfortunately nothing worked :(

@guidolwas right, I will try to put a switch between the router and the OPi to see if it gets better!

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