[FS#3571] Kernel Drops Packets and causes heavy re-transmission

[OpenWrt Bugs]

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

User who did this - Clifford Anup Dhamanigi (cliffordanup) 

Attached to Project - OpenWrt/LEDE Project
Summary - Kernel Drops Packets and causes heavy re-transmission
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on - Netgear R6220
 - Software versions of OpenWrt/LEDE release, packages, etc - OpenWrt 19.07.04 & 19.07.05, mt7621
 - Steps to reproduce - No Specific steps to reproduce the problem. Problem automatically starts occurring after a few weeks of usage. Upon running tcpdump on the bridged lan interface where majority of my clients are connected, many packets were dropped by the Kernel which caused many re-transmissions.

root at OpenWrt:~# tcpdump -i br-lan -w /mnt/sda1/tcpdump/tcpdump.pcap
tcpdump: listening on br-lan, link-type EN10MB (Ethernet), capture size 262144 bytes
^C24604 packets captured
39397 packets received by filter
14785 packets dropped by kernel
root at OpenWrt:~#

During the tcpdump packet capture, all I tried doing was browse various web pages from one client and do a speedtest from another client. The web pages would either never load and load after several re-attempts. Speedtest would fail to complete and error out.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3571

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