[FS#3571] Kernel Drops Packets and causes heavy re-transmission
openwrt-bugs at lists.openwrt.org
Mon Jan 11 16:24:23 EST 2021
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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.
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