Dear Remi,
thank you very much for the pointer to the patch. Sebastian integrated
it into DD-WRT. Now the DynaLink DL-WRX36 runs absolutely smoothly, the
WLAN links are stable, the packet loss is gone. No weird states anymore,
independent from the group key exchange interval:
https://data.saps.uni-ulm.de/index.php/s/NLNpWqjc8iGsaEM
So your idea was a direct hit! Thank you very, very much. Several months
of debugging have come to an end...
Thank you very much and all the best for 2025!
Kind regards,
Steffen
On 19.12.24 4:35 PM, Remi Pommarel wrote:
Hi Steffen.
On Thu, Dec 19, 2024 at 04:02:30PM +0100, Steffen Moser wrote:
Hello everyone,
I've encountered a possible issue in a DD-WRT [1] setup where broadcast
packets stop being delivered after a GTK (Group Temporal Key) exchange. This
issue occurs on a system with the following hardware:
Access Point Hardware: DynaLink DL-WRX36
Router Software: DD-WRT v3.0-r58819 std (12/13/24)
CPU: Qualcomm IPQ8072A
WiFi Chips: Qualcomm QCN5024 and Qualcomm QCN5054
WiFi Driver: ath11k
Firmware: WLAN.HK.2.12-01460-QCAHKSWPL_SILICONZ-1
NSS FW version: NSS.FW.12.5-210-HK.R
Kernel: Linux WL-AP-EG 6.6.64-rt29 #1791 SMP Thu Dec 12 16:41:51 +07
2024 aarch64 DD-WRT
The behavior is such that after a GTK exchange, the AP can get into a "weird
state". When being there, broadcast frames like ARP or mDNS are no longer
reliably delivered to connected clients while unicasts come still through.
In this "weird state", the channel quality (active time vs. busy time) goes
down and latencies to the still reachable WIFI clients rise.
This looks a lot like an issue we hit a while back. There is this patch
[0] from Qualcomm's wlan-open repository. It is a revert of [1]. Using
that the issue was never reproduced. Maybe this can help.
Also adding ath11k list.
Regards.
