[ntp:questions] Re: Time sync with milliseconds with Windows XP

Brad Knowles brad at stop.mail-abuse.org
Tue Sep 6 15:01:53 UTC 2005


At 10:25 AM -0400 2005-09-06, Al Dykes wrote:

>  What about getting a WWV receiver that generates a PPS serial signal
>  and usuing a Y cable to connect it to both machines running real ntp.
>
>  This depends, of course, on being in a location where you can get a
>  WWV (or GPS) signal and have some money to spend on a receiver.

	It doesn't matter how good the time source is.  The problem is 
within the OS and the Microsoft screwed-up time sync code.  You can 
get around part of that by using "real" NTP on the box, but you can't 
get around the OS issues of dropping excessive interrupts under load 
-- not without replacing the OS, which obviously is not suitable in 
many cases.

-- 
Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.



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