On 06/04/2014 02:48 PM, Kalle Valo wrote: > The question doesn't really make sense, at least not to me. But I'll try > to answer anyway :) Thank you - I will try to better state my question. Let's say we have two nodes A and B and A sends a packet to B while monitoring all wireless traffic on mon0. We now have two scenarios when A sees its packet in its monitor interface. The first scenario is, that the packet shows up right after it is send (i.e. after calling socket.send). The other is, that the packet is held in some layer (probably the firmware) until the ACK is received and the packet was really "send" before being passed to the monitoring interface. In my concrete case, I have a program that sends RTP packets to an other host. It logs the time of the socket.send call and then also logs the time the packet is read from mon0 (RTP packets have sequence numbers, so it is easy to match the packets). I then noticed that this delay is usually extremely small (around 0.001 sec), but will quickly rise when the receiver is moved away from the sender (up to 10 seconds and more). Along with this rise in the delay the video quality will degrade to unwatchable when the delay rises quickly (and quickly improves when the delay gets smaller). My assumption is that the packet first has to be acknowledged, before it shows up in the monitoring interface. Due to the movement the connection quality is probably reduced and thus may require retransmissions (and so increase this delay). I am however not sure if this is how it really works :) Thank you, Severin -- 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
