I recently ran into an issue where slaves were all off by exactly one second. I believe that the UTC offset was the source of this issue.
Running linuxptp as grandmaster, the "currentUtcOffset" is reported as 35, and "currentUtcOffsetValid" is reported as 0: # pmc -u -b 0 'get TIME_PROPERTIES_DATA_SET' sending: GET TIME_PROPERTIES_DATA_SET 0cc47a.fffe.63397c-0 seq 0 RESPONSE MANAGMENT TIME_PROPERTIES_DATA_SET currentUtcOffset 35 leap61 0 leap59 0 currentUtcOffsetValid 0 ptpTimescale 1 timeTraceable 0 frequencyTraceable 0 timeSource 0xa0 It is my understanding that the current UTC/TAI offset is 36. In fact, slaves (behind boundary clocks) report a UTC/TAI offset of 36: Here is the output from one slave (behind a single boundary clock): # pmc -u -b 0 'get TIME_PROPERTIES_DATA_SET' sending: GET TIME_PROPERTIES_DATA_SET 0cc47a.fffe.3a2c5c-0 seq 0 RESPONSE MANAGMENT TIME_PROPERTIES_DATA_SET currentUtcOffset 36 leap61 0 leap59 0 currentUtcOffsetValid 1 ptpTimescale 1 timeTraceable 0 frequencyTraceable 0 timeSource 0xa0 I'm running linuxptp (1.5) on CentOS6 (kernel 4.0.4). I am running phc2sys with the following configuration: -s CLOCK_REALTIME -c eth0 I am running ptp4l with the following configuration: -i eth0 -f /etc/ptp4l.conf My ptp4l.conf is the package default, with the exception of the priority1 (set to 125). I tried adding a "-O 36" to the phc2sys command line, but it had no effect on the reported UTC offset. Thanks, Scott Silverman -- DISCLAIMER: NOTICE REGARDING PRIVACY AND CONFIDENTIALITY The information contained in and/or accompanying this communication is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this information, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy of any e-mail and any printout thereof. Electronic transmissions cannot be guaranteed to be secure or error-free. The sender therefore does not accept liability for any errors or omissions in the contents of this message which arise as a result of e-mail transmission. Simplex Trading, LLC and its affiliates reserves the right to intercept, monitor, and retain electronic communications to and from its system as permitted by law. Simplex Trading, LLC is a registered Broker Dealer with CBOE and a Member of SIPC.
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