On Fri, 2019-10-18 at 15:31 +0200, Toke Høiland-Jørgensen wrote: > Well, let's try to do the actual math... A full-size (1538 bytes) packet > takes ~2050 microseconds to transmit at 6 Mbps. Adding in overhead, it's > certainly still less that 4096 us, so 12 bits is plenty. What about A-MSDUs? But I guess maximum continous transmissions are at most 4ms anyway, so a single packet should never be longer. > That leaves > four bits for the ACK status ID if we just split the u16; if we only > ever have "a handful", that should be enough, no? It's how many are in flight at a time, 16 doesn't seem likely to happen, but I don't really know what applications are doing with it now. Probably only wpa_s for the EAPOL TX status. > We could also split 5/11. That would support up to 32 ACK IDs, and we > can just truncate the airtime at 2048 us, which is not a big deal I'd > say. 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? > Think it mostly depends on what is the smallest ID space for ACK IDs we > can live with? :) :) TBH, I don't really know. In a lot of hardware using this is really bad for performance so it shouldn't be used much, so ... johannes
