2011/12/19 李刚 <gang.li@xxxxxxxxxxxxx>: > My wireless card is AR9280. I set the IEEE80211_TX_CTL_NO_ACK flag before > send a packet, but found it no use. It still wait for an ACK. How did you verify that? For unicast frames with IEEE80211_TX_CTL_NO_ACK set you will still see an ACK on the air (since the peer has to generate it according to the 802.11 spec). The only thing this flag does is to advise the hardware to ignore a missing ACK and hence to not retry the frame in this case ... Helmut -- 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