RPi 3B+ gigabit ethernet audio streaming noise

[rkc2006]

I am facing Audio streaming noise issue with Raspberry 3B+ Giga ethernet port.

I have verified Raspbbery 3B+ with various USB dac and observed audio noise, especially with Giga Ethernet port.

Test Setup : USB DAC connected on Raspberry Pi 3B+ and Music stored on Network drive , Both are in Giga (10/100/1000 ports) Ethernet Router , OS volumio /Dietpi , Music files 176k/352k flac files. Audio play with volumio or roon or HQplayer.

The same issue not observed with 10/100 router or switch. Only issue with 10/100/1000 ports.

due to this issue can't take the advantages of Improved 3B+ Ethernet port.

Please help.

[drgeoff]

There are known issues yet to be resolved with ethernet on 3B+. viewtopic.php?f=63&t=208512

The latest official response (on 21 May) was "no fix yet" in viewtopic.php?f=63&t=208512&start=150#p1317961

[ejolson]

due to this issue can't take the advantages of Improved 3B+ Ethernet port.

The improved Ethernet is at most two times faster. In my opinion running at 100 Mbit to enjoy clean sound is not a big loss. You could try shielded CAT6 Ethernet cable to see if that makes a difference.

[rkc2006]

yes Agree 100Mbps sufficient for Audio streaming , same time the network setup uses 10/100/1000 switches or router , need to change the network setup to 10/100

Is any updates going on to solve this issue ?

[jamesh]

We have multiple engineers working on ethernet issues.

We believe there is a problem with tcp segmentation offloading, whether that is the issue here is anyone's guess.

Can you try

`sudo ethtool -K eth0 tx-tcp-segmentation off`

to see if it helps?

[rkc2006]

Hi Thanks for your reply.

sudo ethtool -K eth0 tx-tcp-segmentation off` settings didn't helped.


Streaming Noise issue solved by forcing Onboard ethernet to 100Mbps

executed below command to set 100Mb/s

ethtool -s eth0 speed 100 duplex full

Rahul-KC

[vinteli]

Yes. you should up 200 full duplex . because
RPi 3B allow max set