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

[Dave Täht]

Pete Heist  writes:

> I really like these PCEngines APU2 boards, and PTP HW timestamps. Now Peter,
> back to work... :)

What kernel is this, btw? A *lot* of useful stuff just landed in
net-next for network namespaces, which may mean I can try to validate
your results in emulation, also. My primitive (eyeballing the packet
captures of some tcp traces) jitter result in a 4 virtualized network
namespace, was 2-6us, but that's hardly trustable.

Knowing that basic measurement noise in your setup is < 107us is quite
helpful, I wonder what the sources are

>
> sysadmin@apu2a:~$ ./irtt client -i 1ms -d 10s -q 10.9.0.2
> [Connecting] connecting to 10.9.0.2
> [Connected] connected to 10.9.0.2:2112
>
> MinMean  Median Max  Stddev
> ---  -- ---  --
> RTT   237µs   270µs   268µs   366µs10µs
>  send delay   119µs   135µs   134µs   226µs  7.34µs
>   receive delay   113µs   135µs   134µs   227µs  6.25µs
>
>   IPDV (jitter) 1ns  9.47µs  6.32µs   107µs  9.86µs
>   send IPDV  0s  6.96µs  4.71µs  90.1µs  7.43µs
>receive IPDV  0s  4.92µs  2.61µs  92.5µs  6.84µs
> ...
>
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Re: [Flent-users] [tohojo/flent] packet loss stats (#106)

[Pete Heist]

I really like these PCEngines APU2 boards, and PTP HW timestamps. Now Peter, 
back to work... :)

```
sysadmin@apu2a:~$ ./irtt client -i 1ms -d 10s -q 10.9.0.2
[Connecting] connecting to 10.9.0.2
[Connected] connected to 10.9.0.2:2112

MinMean  Median Max  Stddev
---  -- ---  --
RTT   237µs   270µs   268µs   366µs10µs
 send delay   119µs   135µs   134µs   226µs  7.34µs
  receive delay   113µs   135µs   134µs   227µs  6.25µs
   
  IPDV (jitter) 1ns  9.47µs  6.32µs   107µs  9.86µs
  send IPDV  0s  6.96µs  4.71µs  90.1µs  7.43µs
   receive IPDV  0s  4.92µs  2.61µs  92.5µs  6.84µs
...
```

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