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Stats should also be collected for unsuccessful packets. rtx-rtt is very important for determining the necessary configured latency on the jitterbuffer. It's especially important to be able to increase the latency when retransmitted packets arrive too late and are considered lost. This patch includes these late packets in the calculation of the various rtx stats, making them more correct and useful. Also in the case where the original packet arrives after a NACK is sent, the received RTX packet should update the stats since it provides useful information about RTT. The RTT is only updated if and only if all requested retranmissions are received. That way the RTT is guaranteed to make sense. If not we don't know which request the packet is a response to and the RTT may be bogus. A consequence of this patch is that RTT is not updated for a request when one of the RTX packets for that seqnum is lost, but that since measured RTT will be more accurate. The implementation store the RTX information from the timed out timers and use this when the retransmitted packet arrives. For performance these timers are stored separately from the "normal" timers in order to not impact performance (see attached performance test). https://bugzilla.gnome.org/show_bug.cgi?id=769768 |
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