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<== Date ==> <== Thread ==>

Subject: Re: time stamp on vxWorks jumping to the future
From: "Hartman, Steven M." <hartmansm@ornl.gov>
To: Dirk Zimoch <dirk.zimoch@psi.ch>
Cc: EPICS Tech Talk <tech-talk@aps.anl.gov>
Date: Tue, 28 Nov 2017 17:03:18 +0000
> On Nov 27, 2017, at 9:04 PM, Michael Davidsaver <mdavidsaver@gmail.com> wrote:
> 
> On 11/27/2017 02:47 AM, Dirk Zimoch wrote:
> 
>>>>> Can a corrupted NTP message cause this?
> 
> This depends on how much, if any, validation is done by sntpcTimeGet().


Very little validation. Nothing to check if the reported time is sensible as compared to the previously known local time. 

Dirk, what type of device is your NTP server and where does it get its time? I recall that SNS had a GPS for the timing system which worked fine for the timing system’s time stamp, but it wasn’t considered reliable to use as an NTP server. Can you monitor what your NTP server is reporting? 

-- 
Steven Hartman
hartmansm@ornl.gov






Replies:
Re: time stamp on vxWorks jumping to the future Andrew Johnson
References:
time stamp on vxWorks jumping to the future Dirk Zimoch
Re: time stamp on vxWorks jumping to the future Dirk Zimoch
Re: time stamp on vxWorks jumping to the future Michael Davidsaver
Re: time stamp on vxWorks jumping to the future Dirk Zimoch
Re: time stamp on vxWorks jumping to the future Michael Davidsaver

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