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- To: chrony-dev@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-dev] SW/HW timestamping on Linux
- From: Denny Page <dennypage@xxxxxx>
- Date: Fri, 11 Nov 2016 22:35:42 -0800
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Miroslav,
These are representative samples of what I am seeing. These are all taken from my dedicated monitoring system.
192.168.230.240 and 192.168.230.244 are hardware units on the switch.
192.168.230.245 is a locally attached hardware unit.
192.168.230.1 is a FreeBSD system running ntpd.
192.168.230.2 is a Linux server on the switch running the same version of chrony and timestamp config as the monitor.
192.168.225.10 is a Linux server two switches and a firewall away running the same version of chrony and timestamp config as the monitor.
Other than the baseline with the prior repo version, the chrony to chrony peers have xleave enabled.
Please let me know if you have any questions.
Denny
—
Non timestamp version (prior repo version):
210 Number of sources = 6
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.230.240 1 0 377 0 -132ns[ -142ns] +/- 24us
^? 192.168.230.244 1 0 377 0 +190ns[ +180ns] +/- 24us
^? 192.168.230.245 1 0 377 0 +267ns[ +257ns] +/- 21us
=? 192.168.230.1 2 3 377 25 +2817ns[+2896ns] +/- 1480us
=? 192.168.230.2 2 1 377 0 +9384ns[+9384ns] +/- 80us
=? 192.168.225.10 2 1 377 11 -454ns[ -421ns] +/- 167us
210 Number of sources = 6
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
192.168.230.240 57 27 68 -0.000 0.008 -0ns 311ns
192.168.230.244 64 37 77 -0.003 0.006 -22ns 327ns
192.168.230.245 51 31 65 +0.001 0.007 +356ns 264ns
192.168.230.1 16 6 209 -0.027 0.092 +44us 4799ns
192.168.230.2 36 16 78 -0.005 0.065 +8794ns 2393ns
192.168.225.10 20 11 263 -0.003 0.049 -4115ns 4324ns
With software timestamps:
210 Number of sources = 6
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.230.240 1 0 377 1 +884ns[ +895ns] +/- 19us
^? 192.168.230.244 1 0 377 1 +513ns[ +513ns] +/- 18us
^? 192.168.230.245 1 0 377 0 +789ns[ +789ns] +/- 17us
=? 192.168.230.1 2 3 377 7 +496ns[ +419ns] +/- 1702us
=? 192.168.230.2 2 1 377 1 +10us[ +10us] +/- 70us
=? 192.168.225.10 2 1 377 1 -6797ns[-6797ns] +/- 160us
210 Number of sources = 6
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
192.168.230.240 42 18 53 +0.000 0.003 +0ns 83ns
192.168.230.244 64 33 89 -0.000 0.001 +19ns 92ns
192.168.230.245 64 35 90 -0.001 0.002 +314ns 126ns
192.168.230.1 26 10 202 +0.005 0.017 +4447ns 1418ns
192.168.230.2 21 7 45 -0.069 0.134 +11us 2489ns
192.168.225.10 16 4 39 -0.023 0.325 +1543ns 3726ns
With hardware timestamps:
210 Number of sources = 6
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.230.240 1 0 377 0 +68ns[ +71ns] +/- 13us
^? 192.168.230.244 1 0 377 0 -15ns[ -12ns] +/- 13us
^? 192.168.230.245 1 0 377 0 -2127ns[-2127ns] +/- 6592ns
=? 192.168.230.1 2 3 377 5 +4730ns[+4709ns] +/- 1113us
=? 192.168.230.2 2 1 377 2 +7042ns[+7031ns] +/- 65us
=? 192.168.225.10 2 1 377 0 +8856ns[+8859ns] +/- 150us
210 Number of sources = 6
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
192.168.230.240 64 33 74 -0.000 0.003 -0ns 153ns
192.168.230.244 64 35 75 +0.000 0.003 -19ns 145ns
192.168.230.245 64 29 75 +0.001 0.002 -2115ns 106ns
192.168.230.1 16 6 121 +0.073 0.041 +5859ns 1343ns
192.168.230.2 63 30 149 -0.016 0.020 +4040ns 2099ns
192.168.225.10 31 15 66 +0.011 0.109 +5302ns 3002ns
210 Number of sources = 6
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.230.240 1 0 377 0 +229ns[ +247ns] +/- 13us
^? 192.168.230.244 1 0 377 0 +198ns[ +216ns] +/- 13us
^? 192.168.230.245 1 0 377 0 -2011ns[-1993ns] +/- 6622ns
=? 192.168.230.1 2 3 377 1 +12us[ +12us] +/- 1622us
=? 192.168.230.2 2 1 377 0 +3616ns[+3634ns] +/- 63us
=? 192.168.225.10 2 1 377 2 -9028ns[-9018ns] +/- 153us
210 Number of sources = 6
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
192.168.230.240 64 37 75 +0.000 0.003 +0ns 152ns
192.168.230.244 64 33 75 +0.001 0.003 -2ns 151ns
192.168.230.245 58 35 69 -0.001 0.002 -2151ns 92ns
192.168.230.1 40 22 331 +0.010 0.008 +12us 1453ns
192.168.230.2 64 29 141 -0.007 0.024 +4385ns 2214ns
192.168.225.10 22 9 46 -0.108 0.179 -8603ns 3470ns
—
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