Ax88179 slow transfer

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi ,

I have opernwrt as vm on proxmox with bridge nic & ax88179 gigabit as usb ethernet

kmod-usb-net-asix-ax88179 installed . but its have slow tranfer measured by iperf3 as below result : 192.168.10.134 is ip for bridged Ethernet nic
iperf3 -c 192.168.10.134
Connecting to host 192.168.10.134, port 5201
[ 4] local 192.168.10.1 port 56757 connected to 192.168.10.134 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.04 sec 11.2 MBytes 90.1 Mbits/sec 19 24.0 KBytes
[ 4] 1.04-2.06 sec 11.2 MBytes 91.9 Mbits/sec 24 26.9 KBytes
[ 4] 2.06-3.05 sec 10.7 MBytes 90.7 Mbits/sec 18 29.7 KBytes
[ 4] 3.05-4.04 sec 10.7 MBytes 90.8 Mbits/sec 21 31.1 KBytes
[ 4] 4.04-5.06 sec 11.0 MBytes 90.4 Mbits/sec 19 25.5 KBytes
[ 4] 5.06-6.02 sec 10.4 MBytes 90.3 Mbits/sec 20 25.5 KBytes
[ 4] 6.02-7.09 sec 11.8 MBytes 91.8 Mbits/sec 25 24.0 KBytes
[ 4] 7.09-8.02 sec 9.88 MBytes 89.9 Mbits/sec 14 24.0 KBytes
[ 4] 8.02-9.06 sec 11.4 MBytes 91.2 Mbits/sec 26 28.3 KBytes
[ 4] 9.06-10.05 sec 10.9 MBytes 92.2 Mbits/sec 18 29.7 KBytes

[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.05 sec 109 MBytes 90.9 Mbits/sec 204 sender
[ 4] 0.00-10.05 sec 109 MBytes 90.9 Mbits/sec receiver

iperf Done.

==========
192.168.10.135 is ip for ax88179 usb ethernet
iperf3 -c 192.168.10.135
Connecting to host 192.168.10.135, port 5201
[ 4] local 192.168.10.1 port 60113 connected to 192.168.10.135 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 632 KBytes 5.18 Mbits/sec 0 56.6 KBytes
[ 4] 1.00-2.00 sec 577 KBytes 4.73 Mbits/sec 0 82.0 KBytes
[ 4] 2.00-3.00 sec 557 KBytes 4.56 Mbits/sec 0 102 KBytes
[ 4] 3.00-4.00 sec 557 KBytes 4.56 Mbits/sec 0 113 KBytes
[ 4] 4.00-5.00 sec 557 KBytes 4.56 Mbits/sec 0 122 KBytes
[ 4] 5.00-6.00 sec 560 KBytes 4.59 Mbits/sec 0 123 KBytes
[ 4] 6.00-7.00 sec 559 KBytes 4.58 Mbits/sec 0 123 KBytes
[ 4] 7.00-8.00 sec 560 KBytes 4.59 Mbits/sec 0 123 KBytes
[ 4] 8.00-9.00 sec 560 KBytes 4.59 Mbits/sec 0 123 KBytes
[ 4] 9.00-10.00 sec 560 KBytes 4.59 Mbits/sec 0 123 KBytes

[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 5.55 MBytes 4.65 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 5.53 MBytes 4.64 Mbits/sec receiver

openwrt 18.06.1 & snapshot same behavior .

Also i have tried same ethernet on Ubuntu with kernel 4.15.0-43 , its working good as expected so its not hardware problem .

So i think its kernel problem 4.14.90 "snapshot one" & below this version or kmod modules problem ?

2

Just to clarify , you think youve found a kernel bug or kmod bug? Maybe edit your thread’s title and put that in brackets . Ill preface this that i dont have knowledge if fixing kernel bugs, but will try assist with gathering info for others to help you.

  • What modules are being used during all openwrt variations youve tried so far? (Pastebin the output from dmesg somewhere)
  • What hardware devices is the kernel seeing (eg what does lspci -v show pre and post)
  • You mentioned this is running as a VM, anything else you can change to simplify/isolate this? Can you temporarily reserve full cpu, memory, and disk resources?
  • have you tried on an earlier openwrt version ?eg first 18.0 version? Same result?
  • have you tried on latest trunk snapshot version? (Double check lspci and lsmod and show differences first )
3

I have tried 17.06.1 lede with same issue

4

Did you tried to run "top" from terminal and watch at cpu usage?, maybe for some reason your out of cpu when
you doing the test!

6

Ended by assign usb ethernet as ethernet in the host then forward it to guest . that worked good for me

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7

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