[ntp:hackers] ntpdate offset from ntpd?

houston.jim at comcast.net houston.jim at comcast.net
Tue Dec 10 21:47:52 UTC 2013


----- Original Message -----
> From: "John Stultz" <john.stultz at linaro.org>
> >
> > ntpdate doesn't seem to use the SO_TIMESTAMP option, so I think it
> > could be the delay between kernel time stamping and user-space time
> > stamping.
> 
> Huh. Sounds plausible.
> 
> Although I'm running in a virtualized environment, so I don't think
> SO_TIMESTAMP is supported there.
> 
> But I'll have to dig in and find out. Thanks for the idea!

Hi John,

I had missed that the issue was the difference between ntp vs. ntpdate.

I would be suspicious of the virtual environment.  It may be  
introducing an asymmetrical network delay.  It is not obvious to me
why it would effect ntp differently from ntpdate.

Jim Houston


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