On 2013-02-27 9:58 AM, abhinav narain wrote: > > Thanks Felix, I think I wasn't clear in asking my question. > Sorry about that, is it possible you can answer one below ? > On Tue, Feb 26, 2013 at 6:03 PM, Felix Fietkau <n...@openwrt.org > <mailto:n...@openwrt.org>> wrote: > > On 2013-02-26 7:51 PM, abhinav narain wrote: > > Thanks for the response, Felix ! > > I have some questions to ask : > > > > (1) So I should interpret the ath_tx_status descriptor as : > > 14 retransmissions occurred while transmission of 1542*4 bytes. > > Its not 14*4 retransmissions. > Aggregates are formed by the driver before being passed to the hardware. > The hardware makes no attempt to split them up and deal with individual > subframes separately - this is the driver's job (in the software retry > stage). > > (1) The one thing I wanted to clarify was the size of ampdu : is > it 1542*4 ? > As the timestamp of 4 frames are the same or or the sum of bytes of 4 > frames is 1542 bytes as the descriptor gives 1542 ? I thought ampdu >>1500 bytes (4K or 8K) > Is it because frames are split up ( before ath_tx_complete_buf()) on > their way back to mac80211. Frames are variable length, so obviously A-MPDUs are as well. An A-MPDU is simply a bunch of MPDUs sent together with one PHY header, separated by delimiters.
> (2) Another scenerio that intrigued me was the following : > [timestamp,retx count,rate,seq no. , framesize ] > [315065076,0, 65.0, [], *710*, 1542] > [315065076,14, 65.0,[[65.0, 4], [58.5, 5], [65.0, 5]], *711*, 1542] > [315065599,,0, 65.0,[], *712*, 1542] > If these two (710,711) were sent at the same time : are they ampdu ? I > guess not ! > But there are two different values of rates in ath_rx_status descriptor, > which I can't reconcile with. > > Please throw some light on the above two cases. There's code in current ath9k that passes the A-MPDU rx status to mac80211 for inclusion in radiotap. I suggest you rely on hardware information instead of guesswork. - Felix _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
