[ntp:questions] get current drift value

April xiaoxia2005a at yahoo.com
Wed Mar 2 04:22:32 UTC 2011


On Mar 1, 7:39 pm, unruh <un... at wormhole.physics.ubc.ca> wrote:
> On 2011-03-01, April <xiaoxia20... at yahoo.com> wrote:
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> > On Mar 1, 3:28?pm, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote:
> >> April wrote:
> >> > is there a way to get the current drift value, using ntp utilities
> >> > such as ntpq and ntpdc, instead of opening the ntp.drift file?
>
> >> ntpq -c rv
>
> >> This command returns a lot of info:
>
> >> C:\>ntpq -c rv
> >> associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer,
> >> version="ntpd 4.2.7p... at 1.2478-o Feb 23 13:55:41 (UTC+01:00) 2011 ?(1)",
> >> processor="x86", system="Windows", leap=00, stratum=2, precision=-19,
> >> rootdelay=0.952, rootdisp=24.321, refid=241.10.116.86,
> >> reftime=d117d2f5.dc257ff4 ?Tue, Mar ?1 2011 21:17:57.859,
> >> clock=d117d4ee.e17a6898 ?Tue, Mar ?1 2011 21:26:22.880, peer=58961, tc=6,
> >> mintc=3, offset=-6.749, frequency=5.941, sys_jitter=59.553,
> >> clk_jitter=8.906, clk_wander=0.153, ctr_frequency=-5.13
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> >> Near the end you'll notice 'frequency=5.941' which is the current drift
> >> value!
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> >> Terje
>
> >> --
> >> - <Terje.Mathisen at tmsw.no>
> >> "almost all programming can be viewed as an exercise in caching"
>
> > Thanks Terje!  I have an ntp v3 server and the output value looks like
> > ppb (instead of ppm).
>
> Why not tell us what it says, rather than your interpretation. AFAIK it
> has always been ppm.
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>  Also tried ntpdc -c loopinfo which can auto
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> > adjust and get back the values of ppm for both v3 and v4. :-)  April

# ntpq -c rv xxx.xxx.xxx.xxx
assID=0 status=06f4 leap_none, sync_ntp, 15 events, event_peer/
strat_chg,
system="SunOS", leap=00, stratum=2, rootdelay=0.600,
rootdispersion=10.440, peer=26941, refid=171.201.3.126,
reftime=d117e7bb.69219000  Tue, Mar  1 2011 21:46:35.410, poll=10,
clock=d117e973.5ad00000  Tue, Mar  1 2011 21:53:55.354, phase=-0.033,
freq=37218.31, error=2.55
# ntpdc -c loopinfo xxx.xxx.xxx.xxx
***Warning changing to older implementation
***Warning changing the request packet size from 160 to 48
offset:               -0.000033 s
frequency:            37.218 ppm
poll adjust:          30
watchdog timer:       491 s




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