On 5 June 2016 at 03:55, Toke Høiland-Jørgensen <toke@xxxxxxx> wrote: > Adrian Chadd <adrian@xxxxxxxxxxx> writes: > >> I've been working on something similar in freebsd, so cool to see this >> happening here! > > Cool. Do you have code available somewhere? not yet. It was mostly what you just did in ath9k anyway :) The sample rate control module and net80211 already had the duration calculation bits, and I was just trying to figure out how to track it per-node in a useful way without blowing CPU time. > >> The only thing missing atm is STBC and LDPC. My RX airtime code looks >> basically like this one too; but I have TODO items for ensuring >> LDPC/STBC calculations are sane. > > So basically this means taking into account whether there was MIMO in > use (which may lower the transmit time)? My understanding is that (at > least in Linux) this is encoded in the rate tables (i.e. a MIMO rate is > a separate entry). Am I wrong in thinking so? Or is this something else > entirely? The existing routines take GI, MCS rate, channel width; figure out MIMO, and do the math. The assumption is the symbol count is the same. For STBC I think there's an additional symbol at the end (because it's mixed current symbol plus previous symbol.) I forget the details for LDPC. I'll er, go read the standard again. :) -adrian -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
