[Flent-users] [tohojo/flent] packet loss stats (#106)

Pete Heist notifications at github.com
Tue Nov 21 09:39:07 EET 2017


> On Nov 20, 2017, at 10:44 PM, flent-users <notifications at github.com> wrote:
> 
> A goal for me has been to be able to run Opus at 24 bit, 96Khz, with 2.7ms
> sampling latency.
> Actually getting 8 channels of that through a loaded box would be marvelous.

Sounds like a musician. :) If it were CBR, I don’t know if this is a way to estimate it:

2.7ms ~= 370 packets/sec
@128kbps, 56 bytes / packet (44 data + 12 RTP)
@256kbps, 99 bytes / packet (87 data + 12 RTP)

Just for fun, a ~256 kbps test between two sites, 50km apart, both using p2p WiFi to the Internet. For realtime audio, I guess it’s the maximums that could be the biggest issue.

```
% ./irtt client -i 2.7ms -l 99 -q -d 10s a.b.c.d
[Connecting] connecting to a.b.c.d
[Connected] connected to a.b.c.d:2112

                         Min     Mean   Median      Max  Stddev
                         ---     ----   ------      ---  ------
                RTT  10.16ms  15.57ms  14.14ms  71.37ms  4.89ms
         send delay    4.5ms   8.01ms   6.85ms   33.1ms   3.6ms
      receive delay   4.99ms   7.56ms   6.93ms  64.86ms  3.05ms
                                                               
      IPDV (jitter)   1.06µs   2.52ms   2.56ms  56.16ms  2.55ms
          send IPDV     50ns    2.1ms   1.93ms  25.94ms  2.18ms
       receive IPDV     49ns   1.14ms    663µs  58.63ms   1.9ms
                                                               
     send call time   38.2µs   83.2µs           13.46ms   310µs
        timer error      2ns   44.7µs           18.23ms   620µs
  server proc. time   33.6µs   47.4µs             242µs  18.1µs

                duration: 10.2s (wait 214.1ms)
   packets sent/received: 3647/3644 (0.08% loss)
 server packets received: 3644/3647 (0.08%/0.00% loss up/down)
     bytes sent/received: 361053/360756
       send/receive rate: 288.9 Kbps / 288.7 Kbps
           packet length: 99 bytes
             timer stats: 57/3704 (1.54%) missed, 1.65% error
```

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