[FS#4221] R7800 poor download rate when client connects with 100FD

[OpenWrt Bugs]

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

User who did this - Ernie63 (Ernie63) 

Attached to Project - OpenWrt/LEDE Project
Summary - R7800 poor download rate when client connects with 100FD
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Netgear Nighthawk X4S R7800 with OpenWrt 21.02.1 freshly installed

ISP line is 250/25. Wan port is 1G (auto).

Steps to reproduce:
Laptop connected on LAN-side with 1G (auto): Ookla speedtest is 250/25.
Laptop connected on LAN-side with 100FD: Ookla speedtest is only 30/25.

This performance degration only occurs, when the R7800 is routing and natting the traffic. 
"Switched only" traffic inside the LAN is not affected.

With stock ROM the download rate is as expected:
Laptop connected on LAN-side with 100FD: Ookla speedtest is 80/25.






 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4221

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