[Make-wifi-fast] [PATCH v2 1/4] mac80211: Rearrange ieee80211_tx_info to make room for tx_time_est

[Toke Høiland-Jørgensen]

Johannes Berg <johannes at sipsolutions.net> writes:

> On Fri, 2019-10-18 at 16:01 +0200, Toke Høiland-Jørgensen wrote:
>> 
>> > We can also play with the units of the airtime, e.g. making that a
>> > multiple of 2 or 4 us? Seems unlikely to matter much?
>> 
>> Sure, that's a good point! Increments of 4us means we can fit 4ms is 10
>> bits, leaving plenty of space for ACK IDs (hopefully).
>
> If you do need more bits (e.g. to be on the safe side and have space for
> 8ms) you could also steal bits out of 'band' (we only need 3 I think)
> and 'hw_queue' (not sure what the limit really is, but there aren't many
> users, seems like only iwlwifi/dvm and hwsim care, and those certainly
> don't need >32 queues).
>
> Of course if you leave more bits for later that's good too ;-)

Yeah, let's leave that for later. After all, with the limits we
currently have configured, if a single packet takes up 4096 us, that
will trigger the per-station queue throttling in itself, so I think
we'll be fine (famous last words).

-Toke