[Nfd-dev] Nack receive duplicate on ndnperf

[Ishita Dasgupta]

Hi All,

I am trying to download a file using ndnperf client on 10 different nodes
and some of them ressult in incomplete downloads. On simply running a
"ndnperf prefix" to test the network stats, I see some of the nodes return
"Nack receive : Duplicate" after one point.

root at ca39c32f18d3:/ndnperf/c++/client/bin# ./ndnperf -p /edu/ishita
> Client start with window = 32
> Server signature type = DigestSha256
> Server packet size = 8192
> Wed Dec 19 14:53:14 2018 - 84864 Kbps ( 1326 pkt/s) - latency = 47951 us
> Wed Dec 19 14:53:16 2018 - 84978 Kbps ( 1333 pkt/s) - latency = 47978 us
> Wed Dec 19 14:53:18 2018 - 81318 Kbps ( 4737 pkt/s) - latency = 12513 us
> Wed Dec 19 14:53:20 2018 - 77736 Kbps ( 6633 pkt/s) - latency = 5995 us
> Wed Dec 19 14:53:22 2018 - 61664 Kbps ( 5262 pkt/s) - latency = 6001 us
> Nack receive : Duplicate


Could this be the reason behind the incomplete file downloads? Does anyone
know when and why do we see "Nack receive: Duplicate" message on ndnperf?

Regards,
Ishita
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