Pete Heist <notificati...@github.com> 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
>
> Min Mean Median Max Stddev
> --- ---- ------ --- ------
> RTT 237µs 270µs 268µs 366µs 10µs
> 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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