Re: roaming issues on a residential LAN with multiple APs

[Denis Kenzior <denkenz@gmail.com>]

Hi Daniel,

On 11/25/23 18:32, Daniel Barter wrote:
> here are my logs:
> https://gist.github.com/danielbarter/65ddf6aee78546a0e8f9e2d3af65308c
> 
> notice that this is a mix of iwd 2.4 (my distro default) and iwd 2.8.
> 
> Default roaming thresholds are in the 70s right? I am getting down to
> -90dBm without a roam happening.

Default thresholds are -70 db for 2.4 Ghz and -76 for 5Ghz.

I'm not seeing any CQM events in your log, except for this one:

Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_mlme_notify() MLME 
notification Notify CQM(64)
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_cqm_event() Beacon lost event
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_mlme_notify() MLME 
notification Notify CQM(64)
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_cqm_event() Beacon lost event
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_link_notify() event 16 on 
ifindex 3
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_mlme_notify() MLME 
notification Del Station(20)
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_mlme_notify() MLME 
notification Deauthenticate(39)
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_deauthenticate_event()
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_mlme_notify() MLME 
notification Disconnect(48)
Nov 24 16:34:15 jasper iwd[768]: src/netdev.c:netdev_disconnect_event()
Nov 24 16:34:15 jasper iwd[768]: Received Deauthentication event, reason: 4, 
from_ap: false
Nov 24 16:34:15 jasper iwd[768]: src/station.c:station_disconnect_event() 3
Nov 24 16:34:15 jasper iwd[768]: src/station.c:station_disassociated() 3
Nov 24 16:34:15 jasper iwd[768]: src/station.c:station_reset_connection_state() 3
Nov 24 16:34:15 jasper iwd[768]: src/station.c:station_roam_state_clear() 3
Nov 24 16:34:15 jasper iwd[768]: src/station.c:station_enter_state() Old State: 
connected, new state: disconnected

Basically a lost-beacon event comes in (twice for some reason) and we're 
disconnected almost instantly after that.  There's no other CQM events that 
would indicate low signal strength where iwd can actually take some action.  Try 
setting a more aggressive roam threshold and see if that helps?  man 5 
iwd.config, RoamThreshold and RoamThreshold5G.

> 
> kernel version is 6.6.0.
> 

It could also be the kernel folks made some change that broke this. For example, 
this looks to be touching the general area:

https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next.git/commit/?id=37c20b2effe987b806c8de6d12978e4ffeff026f

Try reverting or using a version prior to that commit?

Regards,
-Denis