Dave Hart wrote: > On Jan 29, 4:52 am, ma...@ntp.isc.org (Danny Mayer) wrote: >> Dave Hart wrote: >>> Take 2: >>> On Jan 28, 11:52 pm, Terje Mathisen <"terje.mathisen at tmsw.no"> >>> wrote: >>>> I've installed your version, and included -M in my startup parameters: >>>> I get Event Log (Application) messages about stuff like: >>>> System time quantum 1.000 msec, min. slew 6.410 ppm/s >>> Notice the observed quantum 1 msec is less than the threshold I >>> mentioned, so interpolation is disabled. You'll also notice a >>> precision = 1000.0 usec log line, where with interpolation that number >>> is much less than 1000. Your system should keep better time than it >>> did with stock ntpd. If you can avoid any program that changes >>> multimedia timers, you would probably get more precise ntpd >>> timekeeping without -M, allowing interpolation to be used, however any >>> MM timer use and the interpolation will perform very badly. >>>> Clock interrupt period 15.600 msec (startup slew 0.1 usec/period) >>>> Performance counter frequency 14.318 MHz >>>> MM timer resolution: 1..1000000 msec, set to 1 msec >>>> ntpd 4.2....@dlh-qpc-o Jan 28 6:47:59.16 (UTC-08:00) 2009 (51) >>>> which seems to me to indicate that your code is indeed running, but I >>>> don't get any 'filtered... QPC' messages at all? >>> Yeah, that's part of the interpolation. If you want to see them, >>> leave off -M (and avoid Flash, Quicktime, etc). >> If you are going to do this you MUST take account of Flash, Quicktime >> and other multimedia otherwise it's not an acceptable solution. >> Stability and accuracy of the clock are extremely important otherwise we >> wouldn't be using ntp. > > I'm a bit fuzzy on what I MUST do. I've been exhorting that running > without -M on Vista invites brokenness. If stability is extremely > important, run with -M on Vista. If accuracy is extremely important > and you are sure there will be no apps increasing the multimedia timer > resolution, without -M may make you happier. Most likely, Windows > Server 2008 has exactly the same behavior as Vista. It's entirely > reasonable on a server to know that you won't run Flash, Quicktime, or > Java. > > Cheers, > Dave Hart
Actually that's untrue. We run Tomcat on many of our Windows Servers (and I'm running it on several of my XP Laptops) in the office and they specifically enable the hires timer for our applications. Danny Danny _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
