Measuring Path specific connection statistics

[sanjaybhat2004]

Hello, we currently have a picoquic connection, which has a client and server setup, via a multipath connection. We were interested in measuring data such as number of packets sent, number of bytes sent, over each path. For number of packets part, our first approach was to have a similar solution as given in picoquic_sample, so we printed out the data cnx.path[i].pkt_ctx.send_sequence. However, when we went through the qlog file, and filtered for packet_sent we found out that both the numbers did not match up.

So our question is, 1) what is the reason behind them not matching, and which one should be preferred for data?
2) Where can we get statistics regarding amount of bytes sent via each path?
3) The above cases only deal with finding out the statistics in client, is there any way the server can the path statistics without the client having to explicitly find it out and send?

[huitema]

1. The packet number sequence is per path. There will packets number 1, 2, 3 on each path, and they will all be different packets.

2. Look at the definition of path quality parameters in picoquic.h, starting with:

/*
* The calls to picoquic_get_path_quality takes as argument a structure
* of type `picoquic_path_quality_t`.
...

3. The path quality monitoring APIs can be used at the server as well as the client.