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Bufferboat Occurs even with QOS after Latest Firmware Upgrade.

Bufferboat Occurs even with QOS after Latest Firmware Upgrade.

Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
2 weeks ago
Tags: #Firmware Update
Model: Archer AX72 Pro  
Hardware Version: V1
Firmware Version: 1.4.5 Build 20250928 rel.17568(5553)

Network Information:

 

Router: Archer AX72 Pro V1.0  


Firmware Version:  1.4.5 Build 20250928 rel.17568(5553)

 

ISP: Charter Spectrum


 

 

I've done the current tests:

 

Different Ethernet cable.

 

Tried version 1.4.2

 

Reset router (3 times)

 

Tried different DNS

 

Tried Modem Directly to PC.

 

QOS at lower settings.

 

 

Summarization of Issue:

 

Before update  Ping during speed test in particular stayed stable around 30 ms during up and down.  

After update:  Ping jumps slightly during download but mostly stable.  During upload it jumps from 30 - 1800 ms.

 

I know there is buffer bloat on my network directly but, with the previous update it was mitigated perfectly.

 

 

Looking through the forums I noticed the AX55 V1 had a similar issue with a firmware update shown here: https://community.tp-link.com/us/home/threads/topic/843210

 

 

I believe this is a firmware issue similar and wanted to provide the information.

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#1
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5 Reply
Re:Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
2 weeks ago - last edited 2 weeks ago

  @CinematicVision It sounds like the NAT boost is taking priority over the software QoS. When you see upload latency spike to 1800ms despite QoS being on, it means the router is bypassing the CPU's traffic shaper entirely and sending packets at line rate, filling the modem's buffer. The new firmware might have enabled flow acceleration to improve max throughput numbers, inadvertently breaking QoS queue management.

 

Some things to try:

  1. Set your QoS upload limit to 1 mbps and run a speed test. If your upload speed is still higher than 1 mbps, it confirms the router is ignoring your QoS settings.

  2. Check Advanced > System Tools > System Parameters. If you see an option for NAT boost, disable it. This forces traffic through the CPU and usually restores QoS functionality (at the cost of slightly higher CPU usage).

 

If NAT boost is missing or the 1 mbps test fails, you will likely need beta firmware, similar to the fix released for the AX55 V1.

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#2
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Re:Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
2 weeks ago - last edited 2 weeks ago

  @abermuffin 

Hello yes, the speeds are affected but the ping remains unstable.  There also is not a nat boost options.

 

 

 

Edit: Tested again with the QOS of 1 mbps for uplod again like suggested and the download is limited like normal but the upload stalls before it boosts to maximum of my plan ignoring QOS.

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#3
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Re:Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
2 weeks ago - last edited 2 weeks ago

Hello @CinematicVision ,

Thanks for contacting our community.

 

Did you say that downgrading to firmware version 1.4.2 would fix this unexpected behavior? If so, I suggest you manually downgrade to 1.4.2 first.

 

We have reported this anomaly to the relevant department and will continue to monitor feedback.

 

If possible, we would appreciate it if you could help us collect the following information to forumsupport.usa@tp-link.com :

 

Subject: [Forum Escalation][ID 849360] Bufferboat Occurs even with QOS after Latest Firmware Upgrade.

Forum Nickname: CinematicVision

Thread URL: https://community.tp-link.com/us/home/forum/topic/849360

Model&Version: Archer AX72 Pro V1 1.4.5

Description: 

Any Other Relevant Information: Please attach the configuration file and system log on your router for further investigation.

How to view and save System Log of TP-Link wireless router

How to create and restore from a backup file on your TP-Link Router

 

Once sent, a ticket will be created in our support system, and a member of the team will follow up to gather more information or troubleshoot the case.

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: △Pre-release Firmware for Archer AX50 Introduces New Parental Control Features and Enhancements △Introducing AI QoS: Elevate Your Gaming Experience on the Archer GE800 Gaming Router △Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN △Tether KidShield Test Recruitment - Safeguarding Children's Online Experience If you found the post or response helpful, please click Helpful. If an answer solves your problem, click "Recommended Solution" so that others can benefit from it.
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#4
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Re:Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
2 weeks ago - last edited 2 weeks ago

  @Joseph-TP 

Hello,

 

Downgrading to 1.4.2 does not help.   I was on  1.3.1 until it auto-updated to 1.4.5 recently and the QOS became broken.  On 1.3.1, QOS worked perfectly and I had no issues with bufferbloat.  However on 1.4.2 AND 1.4.5 the QOS is broken with massive bufferbloat issues.

I'll forward the information requested via email!

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#5
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Re:Bufferboat Occurs even with QOS after Latest Firmware Upgrade.
a week ago

Hello @CinematicVision ,

Thanks for your feedback.

 

We have released beta firmware for Archer AX72 Pro V1. 
QoS Feature Causes BufferBloat and High Latency on Archer Router After Firmware Update.

Please install it and check whether it helps.

 

 

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: △Pre-release Firmware for Archer AX50 Introduces New Parental Control Features and Enhancements △Introducing AI QoS: Elevate Your Gaming Experience on the Archer GE800 Gaming Router △Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN △Tether KidShield Test Recruitment - Safeguarding Children's Online Experience If you found the post or response helpful, please click Helpful. If an answer solves your problem, click "Recommended Solution" so that others can benefit from it.
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#6
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