[ntp:questions] disable pll not working?

David L. Mills mills at udel.edu
Wed Jan 24 04:39:34 UTC 2007


As most folks know, I resist the urge to comment on NTPv3 (xntpd); 
however, I don't know where Yahoo or Youtube or Yazzam latched the 
information that enable/disable pll enables or disables the NTP clock 
discipline. In xntpd, it ONLY enables or disables the kernel discipline. 
In NTPv4 the enable/disable ntp command does enable and disable the 
clock discipline, both in the daemon AND the kernel.


Ronan Flood wrote:

> "Stifi" <stefanjuon at yahoo.com> wrote:
>>sorry, here once again the manpage section in a better readable format:
>>pll          enable
>>Enables the server to adjust  its local  clock.  If  not  set,  the
>>local  clock  free-runs  at   its intrinsic   time   and  frequency
>>offset. This flag  is  useful  in case  the  local  clock  is
>>controlled by some other  device  or protocol  and NTP is used only to
>>provide synchronization to  other clients.
> I believe this is known to be incorrect -- "disable pll" in xntpd tells
> the daemon to discipline the system clock itself; "enable pll" tells the
> daemon to use the kernel to discipline the system clock.

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