[ntp:questions] Experimental ntpd for Windows
Terje Mathisen
"terje.mathisen at tmsw.no" at ntp.org
Thu Jan 29 07:52:57 UTC 2009
Dave Hart wrote:
> Are you using ntpd on Windows and dissatisfied with its timekeeping?
> I have a patched ntpd with changes intended to improve its accuracy
> that could use some wider testing. Source and binaries are linked to
> below.
>
> Two changes are particularly noteworthy:
>
> 1. Code to disable the interpolation approach on systems where the
> Windows system clock is observed to have better than 5ms precision.
> Only Windows Vista so far has been observed with less than 10ms
> increments to the system time of day clock, and then only when some
> software (such as ntpd with -M) has raised the multimedia timer
> resolution. This means -M is recommended by me for Vista users of
> this experimental version. Without -M, ntpd may use interpolation,
> which will work until you browse to a Flash website or launch a Java
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
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 4.2.4p6 at 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?
Vista-64 sp1 btw.
Terje
--
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
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