This device has worked perfectly up to and including 25.12.0. After a straightforward upgrade to 25.12.1 I am experiencing bursts of forwarding delays. I have had to revert to 25.12.0 and it is working well again.
Detail:
- Ubiquiti UniFi 6 Lite
- MediaTek MT7621 ver:1 eco:3
- ramips/mt7621
- SSID on 5g, 802.11r enabled (FT over the Air), in conjunction with a Unifi 6 Plus device
- Raspberry Pi 3b media server near the Lite, connected to the 5g radio
- Zabbix ping polling the Pi every minute over the wired ethernet
Symptoms:
- Zabbix showing no ping response for anything from 1-15 minutes
- Pinging the Pi from a workstation over wired ethernet shows no response for a few packets, then all replies arrive in quick succession, then it settles down.
- Stop the ping for a few seconds, then start and the delayed-first-responses repeats.
- I don't know whether the ping requests or responses are being delayed
- Pi remains associated with the Lite, and does not fail over to the Plus
- Nothing of interest in the Lite logs, in particular nothing related to the Pi MAC
- A pair of crond log entries every minute (wakeup dt=60, file root:) which I presume are benign and weren't there in 25.12.0
Ideas (probably mostly wrong):
- Something to do with wlan power management?
- I saw something about scheduler changes?
I don't know whether this is specific to the chipset, the target, or wider. I would have to wait until a day when noone else is here to do any more experimenting but happy to do so if needed.
Thanks, Chris