https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193907
Bug ID: 193907
Summary: [ath] in HT40 mode set the final rate table entry to
be 20MHz, just in case HT40 reception is terrible.
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Only Me
Priority: ---
Component: wireless
Assignee: freebsd-wireless@FreeBSD.org
Reporter: adr...@freebsd.org
It may be that transmitting 40MHz rates (eg in HT40 2GHz mode) performs really
crappy due to adjacent channel interference.
So:
* teach ath_rate_sample to set the 20MHz flag for the final rate in the rate
table, so there's at least a good fallback
* .. and then maybe have it track how good 20/40 rates are and if too many
fallbacks to 20MHz is done, just fallback to transmitting on 20MHz for a while.
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