| Re: [chrony-dev] SW/HW timestamping on Linux |
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On Thu, Nov 10, 2016 at 02:38:04PM -0800, Denny Page wrote:
> Things are working quite well with software timestamping.
>
> This is from my monitoring system:
> 210 Number of sources = 6
> Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
> ==============================================================================
> 192.168.230.240 40 21 53 +0.000 0.004 -370ns 105ns
> 192.168.230.244 62 35 89 -0.001 0.002 -430ns 108ns
> 192.168.230.245 46 23 60 +0.000 0.004 +0ns 126ns
> 192.168.230.1 42 20 330 -0.009 0.010 -1152ns 1662ns
> 192.168.230.2 38 20 98 +0.014 0.023 +742ns 1163ns
> 192.168.225.10 29 15 1083 -0.007 0.009 +33us 4906ns
This looks very good and I'm curious to see how much further it will
improve with HW timestamping. The offset of ~400ns between the 1st/2nd
and 3rd server could be an asymmetry in delay due to the switch, right?
--
Miroslav Lichvar
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