[FS#3841] Hardware flow offloading sometimes causes network to slow down

[OpenWrt Bugs]

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

User who did this - Jerome Ebuenga (jebuenga) 

Attached to Project - OpenWrt/LEDE Project
Summary - Hardware flow offloading sometimes causes network to slow down
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - I flashed OpenWrt 21.02 RC2 to the following devices:
Ubiquiti EdgeRouter X
MikroTik RouterBOARD 760iGS

The following are enabled:
- Hardflow Flow Offloading
- Packet Steering
- luci-app-sqm: cake, piece-of-cake, 0 download/ 50000 upload
- Firewall and all other settings default (after installation)

I have a Huawei AX3 Pro in bridge mode, connected to one of the ethernet ports of either devices above.

Issue:
When scrolling down on any app like YouTube, Facebook, an RSS app from an Android phone, sometimes the contents don't load or is taking more than 15 seconds to load. This is happening with 2 Android phones, also when using a 4G connection from my provider, this issue doesn't happen. So this is not a problem with the mobile phones.

I have tried the following combinations which didn't fix the issue:

Hardflow Flow Offload (on)
Packet Steering (off)
SQM (off)
-----
Hardflow Flow Offload (on)
Packet Steering (on)
SQM (off)
---
Hardflow Flow Offload (on)
Packet Steering (off)
SQM (on)

But turning off Hardflow Flow Offload seems to fix it. Unfortunately I have a 1 GB connection, so my downloads suffer if I turn this off.

When I flashed OpenWrt 19.07 to Ubiquiti EdgeRouter X with the same settings above, I didn't encounter the issue. I have tried flashing again OpenWrt 21.02 RC2 from 19.07 the 2nd time, and using the same settings, and the issue back again.


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3841

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