I don't understand why anyone would use windows server for anything that needed precision like time.
On Sat, Jun 30, 2012 at 5:39 PM, Keith Medcalf <kmedc...@dessus.com> wrote: > > > Or you can ask the it guys to use a windows server... Eg: > > > > http://support.microsoft.com/kb/816042 > > That is a joke Jared? You left off the smiley. > > Windows doesn't do NTP out-of-the-box (Microsoft assertions to the > contrary notwithstanding). You can build a reasonably working standard > daemon, however don't expect time to be very accurate. Windows > out-of-the-box can keep time +/- 10 minutes or so using the Microsoft > lets-pretend-NTP. > > You can build the current standard NTPD distribution on Windows. You can > also spend lots of time to make it "work as well as possible" (once you > manage to get it to compile, that is). Even so, when you have configured > it to the optimality of accuracy, this is what you can expect: > > remote refid st t when poll reach delay offset > jitter > > ============================================================================== > +tic.nrc.ca .PPS. 1 u 13 64 377 55.544 5.913 > 0.870 > -tac.nrc.ca .ATOM. 1 u 48 64 377 56.188 4.768 > 3.041 > -toc.nrc.ca .ATOM. 1 u 1 64 377 55.485 4.758 > 0.981 > +tick.usask.ca .GPS. 1 u 34 64 377 19.566 6.942 > 5.699 > *tock.usask.ca .GPS. 1 u 29 64 377 19.665 5.955 > 1.937 > -clock.isc.org .GPS. 1 u 37 64 377 53.091 8.311 > 0.649 > +clock.sjc.he.ne .CDMA. 1 u 48 64 377 43.591 6.066 > 2.501 > > offset: 0.005955 s > frequency: 23.346 ppm > poll adjust: -30 > watchdog timer: 47 s > > is about the best you will get. Statistics are pretty awful: > > Date # O.Avg O.Median O.Range O.CI O.Skew > O.Kurt F.Avg F.Median F.Range F.CI F.Kurt > 2012-01 899 0.765559 0.004198 20.05221 0.000371 -0.56023 > 0.751151 21.31698 20.9705 2.9685 0.108050 -0.88068 > 2012-02 9673 0.237434 -7.46502 59.75607 0.000156 -1.43583 > 8.609085 19.01126 19.3495 5.2995 0.040683 -0.54578 > 2012-03 1380 -0.02157 -14.8416 44.00043 0.000124 -1.08589 > 4.559049 18.08941 16.822 7.536 0.045387 0.268831 > 2012-04 1322 0.196654 21.16261 106.1250 0.000141 -0.48643 > 26.05868 17.56811 16.812 6.111 0.040561 -0.38021 > 2012-05 8849 0.118125 27.44213 72.01526 0.000161 0.296114 > 8.939429 17.88685 15.2595 9.3195 0.080186 1.121740 > 2012-06 1457 0.409662 -20.2809 63.32684 0.000114 -1.44144 > 11.98237 20.50724 19.5425 6.7425 0.042372 -0.08891 > 6102 0.201651 21.16261 106.1250 6.065429 -0.84354 > 13.78161 18.71838 16.1125 10.1725 0.023443 1.215941 > > This is from a custom ntpd build using the highest precision that it can > manage to coerce from Windoze. > > Of course, this may be accurate enough for most uses -- at least it does > not have to time-step. > > Doesn't compare to ntpd on linux on an 80286 with 640K ram booting from a > floppy, which can maintain time sync within less than 1 ms easily. > > --- > () ascii ribbon campaign against html e-mail > /\ www.asciiribbon.org > > > > >
