[FS#3260] reduced upload speeds with enabled LAN 'flow control rx/tx'

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Thu Jul 30 18:03:15 EDT 2020


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A new Flyspray task has been opened.  Details are below. 

User who did this - Andy Walsh (Andy2244) 

Attached to Project - OpenWrt/LEDE Project
Summary - reduced upload speeds with enabled LAN 'flow control rx/tx'
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device: WRT-1200AC
Openwrt Version: SNAPSHOT r13982-e9f7923a1d
Kernel: 5.4.x, tried also 5.4.53

Problem/Bug:
If i keep the default 'flow control rx/tx' setting enabled for any LAN port, my upload speeds drop from my max 38 Mbit/s to 10 Mbit/s. Same happens if i put a unmanaged switch behind the router, that has RX/TX enabled and any device behind the switch than gets the reduced 10 Mbit/s upload speeds. The download speeds are unaffected, only the upload speed drops.

Steps to reproduce:
Just disable/enable 'flow control' on the client side for any LAN port. This bug happens independent of client OS/Network card used. Just enable/disable "Flow Control" in the Win10 adapter property page, than do some upload tests.


mv88e6085 f1072004.mdio-mii:00 lan1: Link is Up - 1Gbps/Full - flow control rx/tx

vs

mv88e6085 f1072004.mdio-mii:00 lan1: Link is Up - 1Gbps/Full - flow control off


PS: This worked fine before and i think started with the 5.4.x kernels on mvebu.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3260

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