rkc2006
Posts: 3
Joined: Mon Jun 04, 2018 10:50 am

RPi 3B+ gigabit ethernet audio streaming noise

Mon Jun 04, 2018 11:15 am

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
Posts: 11562
Joined: Wed Jan 25, 2012 6:39 pm

Re: RPi 3B+ gigabit ethernet audio streaming noise

Mon Jun 04, 2018 4:31 pm

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
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ejolson
Posts: 6659
Joined: Tue Mar 18, 2014 11:47 am

Re: RPi 3B+ gigabit ethernet audio streaming noise

Mon Jun 04, 2018 7:29 pm

rkc2006 wrote:
Mon Jun 04, 2018 11:15 am
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
Posts: 3
Joined: Mon Jun 04, 2018 10:50 am

Re: RPi 3B+ gigabit ethernet audio streaming noise

Tue Jun 12, 2018 7:58 am

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
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 28358
Joined: Sat Jul 30, 2011 7:41 pm

Re: RPi 3B+ gigabit ethernet audio streaming noise

Tue Jun 12, 2018 9:24 am

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?
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rkc2006
Posts: 3
Joined: Mon Jun 04, 2018 10:50 am

Re: RPi 3B+ gigabit ethernet audio streaming noise

Thu Jun 14, 2018 5:55 am

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
Posts: 1
Joined: Thu Jun 21, 2018 7:10 am

Re: RPi 3B+ gigabit ethernet audio streaming noise

Thu Jun 21, 2018 7:14 am

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

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