On 11 June 2011 11:15, Liang <leonc...@gmail.com> wrote: > Hi Adrian, > It really works! When adding > the REG_SET_BIT(ah, AR_DIAG_SW, AR_DIAG_ACK_DIS) > after ath9k_hw_process_ini(), Wireshark monitors no IEEE ACK any more. > There is another question. It is found the transmission rate is really low > even with UDP packets after disable the ACK. Does it mean some related > setting/code is needed in the transmitter side to cooperate the receiver's > no ACK?
Well, if you're disabling ACK, then the receiving side won't be able to tell you that it's been successful so you can't retransmit. :) That means any and all collisions, any transient noise, etc is going to be hurting you. Wireless isn't, you know, "perfect". :-) I suggest looking at the receiver errors (CRC for example) and see if they're coinciding with your UDP traffic flow. I also suggest looking at using RTS/CTS as well to see if this helps. Since you're not using any ACKs (and if you're not using contention-free periods and WME/QoS), then it's possible other devices are colliding with your TX. Using RTS may reduce this collision rate somewhat. HTH, Adrian _______________________________________________ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
