[PATCH] scan: evaluate AP-reported channel load

Jouni Malinen j at w1.fi
Fri Oct 15 14:22:26 PDT 2021

On Sun, Oct 03, 2021 at 07:04:05PM +0200, David Bauer wrote:
> When determining the expected throughput from a AP, take the AP-reported
> channel utilization (QBSS Load element) into consideration.

While it would be nice to do something like this to be able to use that
information from the AP, this specific way of doing that would seem to
have a significant risk of penalizing any AP that supports this
capability compared to APs that do not provide any indication which
would be processed as if they had advertised 0% channel load. That does
not feel correct and could result in selecting worse candidates.

I would also point out that at least the last time I did some testing
between vendor implementations, the reported values were completely
different between two APs on the same channel in more or less the same
location in the test setup.. In other words, I would not place much, if
any, trust in this value being something that could be compared between
two different APs. The only thing that seemed to be more or less
comparable was the values from the same AP device in a sense that the
channel load value increased when there was more traffic on the

Jouni Malinen                                            PGP id EFC895FA

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