[RFC PATCH wireless] wifi: mt76: mt7925: get the survey airtime from the firmware

[Chris]

On Sat, Oct 24, 2026 at 1:34 PM Devin Wittmayer
<lucid_duck at justthetip.ca> wrote:
>
> Chris wrote:
> > One thing on offset 20: in monitor mode it doesn't look like all of
> > rx.
>
> You're right, it isn't all of rx. Your numbers made me curious, so I
> tried it here with an A9000 as a 20 MHz monitor next to an Alfa. It
> seems to come down to how strong the signal is. Share of the time:
>
>                                          offset 20   decoded frames
>   one strong neighbour (-22 dBm)            2.3%          2.0%
>   only weak neighbours (-73 dBm or less)    0.0%          3.6%
>   my upload, monitor on a side channel     54.6%          7.5%
>
> Strong signals land in 20 even when the monitor can't decode them,
> including spill from the next channel, and weak ones are left out.
> That would fit what you saw on 5 GHz and on channels 2 to 4.
>
> As a station the A9000's own downlink does show up in 20, so I'd keep
> it as the receive time.
>
> Thanks for the long run against the Wi-Spy, and for the Tested-by.
>
> Devin


Devin Wittmayer wrote:
> As a station the A9000's own downlink does show up in 20, so I'd keep
> it as the receive time.

Makes sense, thanks for running that down. Strong signals counting and
weak ones not explains both of the oddities I saw. For my use, a monitor
hopping channels, busy time is the figure that matters, and that one
held up on every channel.

Happy to test a v2 on the A9000 if one comes.

Chris