[ntp:questions] Issues with Linux 2.6.x and LinuxPPS

unruh unruh at wormhole.physics.ubc.ca
Mon Aug 30 21:44:54 UTC 2010

On 2010-08-30, Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
> Venu Gopal wrote:
>> Dear Friends,
>> I would like to know about any specific configuration settings needed for
>> latest Linux kernels.
>> I am using Linux-2.6.35-2 with ntp-4.2.6p2. Following are the observations:
>> 1. It takes a couple of hours for time to settle down to few usec.
> Absolutely normal!  NTPD can sometimes need up to ten hours to achieve 
> the accuracy it is capable of.
> The design assumes that you will run NTPD 24 X 365.
> If you must run something 9:00 AM to 5:00 PM, NTPD is a poor choice!! 
> If you will use it as designed, NTPD should be able to keep your clock 
> within microseconds of the correct time!
> NTPD has competitors with behavior closer to what you seem to be looking 
> for.  It's my understanding that they have accuracy and stability 
> characteristics decidedly different than NTPD!

Yes, in the case of chrony, much better all around. (speed,

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