Re: [PATCH 0/5] mac80211, iwlwifi, ath9k: Fix rate scaling for IEEE80211_TX_CTL_NO_ACK packets

[Felix Fietkau <nbd@openwrt.org>]

Jouni Malinen wrote:
> On Thu, Apr 23, 2009 at 07:35:55PM +0200, G=C3=A1bor Stefanik wrote:
>> Handling of multicast/NO_ACK packets by mac80211 rate scaling is a
>> mess. Basically, the rule of thumb is that any packet with
>> IEEE80211_TX_CTL_NO_ACK (including multicasts and broadcasts, which
>> always have this flag set) should be sent at lowest rate (unless
>> overridden by radiotap - this is not covered in this patchset), with
>> no retries.
>=20
> While this may be the case with the current rate control
> implementations, this is not a good assumption to make.
> Multicast/broadcast frames could (and often really should) be
> transmitted at higher rate, i.e., the rate control algorithm could
> figure out that all associated STAs should be able to receive frames =
at
> a higher basic rate.
Good idea. I should implement this in minstrel and use the minimum valu=
e
of max_prob_rate for all stations as multicast rate ;)

Johannes: Can you think of a good way to fit this into the API?

- Felix
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