[ntp:questions] What level of timesynch error is typical onWinXP?

David L. Mills mills at udel.edu
Fri Nov 5 20:43:14 UTC 2010


Dave,

Further investigation continues; however, you have a fundamental 
misunderstanding of the "slew limit" in Soalris or any other 
BSD-semantics system. The slew is not a limit, it is an intrinsic 
constant equal to 500 PPM. The slew is implemented in this way. When 
adjtime() is called, it computes the number of timer ticks necessary to 
amortize the given offset at a fixed amount at each tick. Those kernels 
I have seen, including SunOS, Ultrix, OSF/1, Tru64 and Solaris, use an 
increment of 5 microseconds at each interrupt of a 100-Hz clock, which 
results in a slew rate of 500 PPM. There is no issue of "exceeding the 
slew rate", it is an intrinsic constant compiled in the kernel. In days 
past, this value could be tinkered using the tickadj() program, but 
today that is not always possible.

The test I did was to run two tests using initial offsets of +90 ms and 
-90 s. The tests use  ntptime -f 500 or -f -500 for three minutes in 
order to change the offset to about +-90 ms, then start ntpd normally. 
The frequency file was present and very near the expected hardware 
frequency. My results were far different than yours; offset converges to 
within 0.5 ms and frequency surge less than 1 PPM. We need to explain 
why the results are so far different.

Dave

 Dave Hart wrote:

>I have reproduced the problems Miroslav reports with the new startup
>behavior on FreeBSD, indicating the problem is not isolated to Linux.
>My guess is Solaris is the outlier here, because its adjtime() doesn't
>enforce a 500 PPM cap.  The system I'm using is psp-fb2, a FreeBSD 6.4
>x86 machine with the latest ntp-dev snapshot which is known to
>normally keep time well.
>
>I ran several tests, but I think the last is the most interesting.  I
>stopped ntpd and removed its drift file (containing 80.530), then
>slewed the time backward 100 msec using adjtime() and patience.  After
>restarting it takes a few minutes for its three manycast sources to be
>found and sys.peer to be declared.  Five minutes later, the frequency
>is mis-estimated at 236 PPM, about 155 PPM too much.  As a result, the
>system sets up for quite a long settling period with many steps.
>Below are the logs and some billboard snapshots.  Please ignore the
>refclock, it is marked noselect.
>
>If your FreeBSD test machine has a negative ntp.drift, you might see
>worse behavior with a positive initial offset.  I am repeating the
>test with the correct drift file in place now.
>
>Cheers,
>Dave Hart
>
>loopstats
>
>55505 59851.663 0.102341957 0.000 0.036183346 0.000000 6
>55505 60190.664 0.080163684 236.465 0.032321622 0.000000 6
>55505 60257.664 0.053082763 236.465 0.031713930 0.000000 6
>55505 60325.664 0.009274475 236.465 0.033465616 0.000000 6
>55505 60393.664 -0.029456239 236.465 0.034168151 0.000000 6
>55505 60458.664 -0.041054653 236.465 0.032223363 0.000000 6
>55505 60459.664 -0.041380233 236.465 0.030142416 0.000000 6
>55505 60662.664 -0.006418134 236.076 0.030786168 0.137559 6
>55505 60943.120 -0.066341200 234.964 0.035751383 0.413381 6
>55505 61215.145 -0.076412713 233.726 0.033631393 0.584265 6
>55505 61334.664 -0.090128710 233.086 0.031830847 0.591422 6
>55505 61669.516 0.000000000 233.086 0.000001907 0.553225 6
>55505 61748.516 -0.027231614 232.958 0.009627829 0.519476 6
>55505 61883.516 -0.038290456 232.650 0.009818119 0.497985 6
>55505 62351.516 -0.066567566 230.793 0.013575544 0.804986 6
>55505 62555.516 -0.099115749 229.588 0.017137138 0.865194 6
>55505 63161.378 0.000000000 229.588 0.000001907 0.809315 6
>55505 63244.058 -0.033000775 229.425 0.011667536 0.759242 6
>55505 63358.379 -0.044957700 229.119 0.011704101 0.718371 6
>
>ntp.log
>
> 5 Nov 16:27:36 ntpd[57402]: ntpd exiting on signal 15
> 5 Nov 16:34:05 ntpd[58309]: Listen normally on 10 multicast ff05::101 UDP 123
> 5 Nov 16:34:05 ntpd[58309]: Added Multicast Listener ff05::101 on
>interface #10 multicast
> 5 Nov 16:34:05 ntpd[58309]: NTP PARSE support: Copyright (c)
>1989-2009, Frank Kardel
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: initializing PPS to ASSERT
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: reference clock
>"Meinberg GPS16x receiver" (I/O device /dev/refclock-0, PPS device
>/dev/refclock-0) added
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: Stratum 0, trust time
>4d+00:00:00, precision -19
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: rootdelay 0.000000 s,
>phase adjustment 0.001968 s, PPS phase adjustment 0.000000 s, normal
>IO handling
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: Format recognition:
>Meinberg GPS Extended
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: PPS support
>(implementation PPS API)
> 5 Nov 16:34:05 ntpd[58309]: GENERIC(0) 8011 81 mobilize assoc 62401
> 5 Nov 16:34:05 ntpd[58309]: refclock_newpeer: clock type 43 invalid
> 5 Nov 16:34:05 ntpd[58309]: 127.127.43.0 interface 127.0.0.1 -> <null>
> 5 Nov 16:34:05 ntpd[58309]: 192.168.4.255 c811 81 mobilize assoc 62403
> 5 Nov 16:34:05 ntpd[58309]: ff05::101 c811 81 mobilize assoc 62404
> 5 Nov 16:34:05 ntpd[58309]: 0.0.0.0 c016 06 restart
> 5 Nov 16:34:05 ntpd[58309]: 0.0.0.0 c012 02 freq_set kernel 0.000 PPM
> 5 Nov 16:34:05 ntpd[58309]: 0.0.0.0 c011 01 freq_not_set
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: packet format
>"Meinberg GPS Extended"
> 5 Nov 16:34:05 ntpd[58309]: PARSE receiver #0: STATE CHANGE:  -> UTC
>DISPLAY; TIME CODE; (LEAP INDICATION)
> 5 Nov 16:34:05 ntpd[58309]: GENERIC(0) 8024 84 reachable
> 5 Nov 16:34:09 ntpd[58309]: 2001:4f8:fff7:1::29 4011 81 mobilize assoc 62405
> 5 Nov 16:34:09 ntpd[58309]: 2001:4f8:fff7:1::27 4011 81 mobilize assoc 62406
> 5 Nov 16:34:09 ntpd[58309]: 2001:4f8:fff7:1::21 4011 81 mobilize assoc 62407
> 5 Nov 16:35:14 ntpd[58309]: 2001:4f8:fff7:1::27 6024 84 reachable
> 5 Nov 16:35:14 ntpd[58309]: 2001:4f8:fff7:1::29 6024 84 reachable
> 5 Nov 16:35:14 ntpd[58309]: 2001:4f8:fff7:1::21 6024 84 reachable
> 5 Nov 16:37:31 ntpd[58309]: 2001:4f8:fff7:1::27 763a 8a sys_peer
> 5 Nov 16:37:31 ntpd[58309]: 0.0.0.0 c614 04 freq_mode
> 5 Nov 16:40:51 ntpd[58309]: 2001:4f8:fff7:1::29 763a 8a sys_peer
> 5 Nov 16:40:56 ntpd[58309]: 2001:4f8:fff7:1::27 761a 8a sys_peer
> 5 Nov 16:43:10 ntpd[58309]: 0.0.0.0 0612 02 freq_set kernel 236.465 PPM
> 5 Nov 16:43:10 ntpd[58309]: 0.0.0.0 0615 05 clock_sync
> 5 Nov 16:47:38 ntpd[58309]: 2001:4f8:fff7:1::29 761a 8a sys_peer
> 5 Nov 16:47:39 ntpd[58309]: 2001:4f8:fff7:1::27 761a 8a sys_peer
> 5 Nov 16:51:02 ntpd[58309]: 2001:4f8:fff7:1::29 761a 8a sys_peer
> 5 Nov 16:55:43 ntpd[58309]: 2001:4f8:fff7:1::27 761a 8a sys_peer
> 5 Nov 17:00:15 ntpd[58309]: 2001:4f8:fff7:1::29 761a 8a sys_peer
> 5 Nov 17:02:14 ntpd[58309]: 2001:4f8:fff7:1::27 761a 8a sys_peer
> 5 Nov 17:05:51 ntpd[58309]: 2001:4f8:fff7:1::29 761a 8a sys_peer
> 5 Nov 17:05:51 ntpd[58309]: 0.0.0.0 0613 03 spike_detect -0.134925 s
> 5 Nov 17:07:49 ntpd[58309]: 2001:4f8:fff7:1::27 761a 8a sys_peer
> 5 Nov 17:07:49 ntpd[58309]: 0.0.0.0 061c 0c clock_step -0.147872 s
> 5 Nov 17:07:49 ntpd[58309]: 0.0.0.0 0615 05 clock_sync
> 5 Nov 17:07:50 ntpd[58309]: GENERIC(0) 8014 84 reachable
> 5 Nov 17:07:50 ntpd[58309]: 0.0.0.0 c618 08 no_sys_peer
> 5 Nov 17:07:52 ntpd[58309]: 2001:4f8:fff7:1::29 6024 84 reachable
> 5 Nov 17:07:53 ntpd[58309]: 2001:4f8:fff7:1::21 6014 84 reachable
> 5 Nov 17:08:59 ntpd[58309]: 2001:4f8:fff7:1::27 6024 84 reachable
> 5 Nov 17:09:08 ntpd[58309]: 2001:4f8:fff7:1::29 763a 8a sys_peer
> 5 Nov 17:19:11 ntpd[58309]: 2001:4f8:fff7:1::27 763a 8a sys_peer
> 5 Nov 17:30:29 ntpd[58309]: 2001:4f8:fff7:1::29 761a 8a sys_peer
> 5 Nov 17:30:29 ntpd[58309]: 0.0.0.0 0613 03 spike_detect -0.132284 s
> 5 Nov 17:32:41 ntpd[58309]: 2001:4f8:fff7:1::27 761a 8a sys_peer
> 5 Nov 17:32:41 ntpd[58309]: 0.0.0.0 061c 0c clock_step -0.138054 s
> 5 Nov 17:32:41 ntpd[58309]: 0.0.0.0 0615 05 clock_sync
> 5 Nov 17:32:42 ntpd[58309]: GENERIC(0) 8014 84 reachable
> 5 Nov 17:32:42 ntpd[58309]: 0.0.0.0 c618 08 no_sys_peer
> 5 Nov 17:32:46 ntpd[58309]: 2001:4f8:fff7:1::29 6024 84 reachable
> 5 Nov 17:32:47 ntpd[58309]: 2001:4f8:fff7:1::27 6024 84 reachable
> 5 Nov 17:32:47 ntpd[58309]: 2001:4f8:fff7:1::21 6014 84 reachable
> 5 Nov 17:34:04 ntpd[58309]: 2001:4f8:fff7:1::21 762a 8a sys_peer
> 5 Nov 17:35:58 ntpd[58309]: 2001:4f8:fff7:1::27 763a 8a sys_peer
> 5 Nov 17:35:59 ntpd[58309]: ntpd exiting on signal 15
>
>billboards
>Slewed -0.1 seconds
>Starting ntpd.
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=c011 leap_alarm, sync_unspec, 1 event, freq_not_set,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=11, stratum=16,
>precision=-19, rootdelay=0.000, rootdisp=0.120, refid=INIT,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>clock=d07eb086.9a67600b  Fri, Nov  5 2010 16:34:14.603, peer=0, tc=3,
>mintc=3, offset=0.000, frequency=0.000, sys_jitter=0.000,
>clk_jitter=0.002, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    6   16    3    0.000   68.458   0.006
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=c011 leap_alarm, sync_unspec, 1 event, freq_not_set,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=11, stratum=16,
>precision=-19, rootdelay=0.000, rootdisp=0.450, refid=INIT,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>clock=d07eb09b.dc19ec10  Fri, Nov  5 2010 16:34:35.859, peer=0, tc=3,
>mintc=3, offset=0.000, frequency=0.000, sys_jitter=0.000,
>clk_jitter=0.002, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l   13   16    7    0.000   69.319   0.858
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=c011 leap_alarm, sync_unspec, 1 event, freq_not_set,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=11, stratum=16,
>precision=-19, rootdelay=0.000, rootdisp=1.080, refid=INIT,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>clock=d07eb0c6.3a5a6b6b  Fri, Nov  5 2010 16:35:18.227, peer=0, tc=3,
>mintc=3, offset=0.000, frequency=0.000, sys_jitter=0.000,
>clk_jitter=0.002, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    8   16   77    0.000   71.615   2.577
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
> psp-deb1.ntp.or 192.168.4.22     3 u    4   64    1    0.209   89.250   0.002
> psp-fb1.ntp.org 204.123.2.5      2 u    2   64    1    0.323   91.405   0.200
> psp1.ntp.org    12.142.174.97    3 u    2   64    1    0.485   85.442   0.151
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=c011 leap_alarm, sync_unspec, 1 event, freq_not_set,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=11, stratum=16,
>precision=-19, rootdelay=0.000, rootdisp=1.410, refid=INIT,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>clock=d07eb0db.bea3b12d  Fri, Nov  5 2010 16:35:39.744, peer=0, tc=3,
>mintc=3, offset=0.000, frequency=0.000, sys_jitter=0.000,
>clk_jitter=0.002, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l   13   16  177    0.000   71.409   2.121
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
> psp-deb1.ntp.or 192.168.4.22     3 u   25   64    1    0.209   89.250   0.002
> psp-fb1.ntp.org 204.123.2.5      2 u   23   64    1    0.323   91.405   0.200
> psp1.ntp.org    12.142.174.97    3 u   23   64    1    0.485   85.442   0.151
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=c011 leap_alarm, sync_unspec, 1 event, freq_not_set,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=11, stratum=16,
>precision=-19, rootdelay=0.000, rootdisp=2.070, refid=INIT,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>clock=d07eb107.bfb22e76  Fri, Nov  5 2010 16:36:23.748, peer=0, tc=3,
>mintc=3, offset=0.000, frequency=0.000, sys_jitter=0.000,
>clk_jitter=0.002, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    9   16  377    0.000   75.381   3.924
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
> psp-deb1.ntp.or 192.168.4.22     3 u    3   64    3    0.198   94.555   5.305
> psp-fb1.ntp.org 204.123.2.5      2 u    3   64    1    0.323   91.405   0.200
> psp1.ntp.org    12.142.174.97    3 u   67   64    2    0.485   85.442   0.151
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0614 leap_none, sync_ntp, 1 event, freq_mode,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=3,
>precision=-19, rootdelay=1.041, rootdisp=1062.285, refid=146.144.108.74,
>reftime=d07eb14b.a9c0b4b0  Fri, Nov  5 2010 16:37:31.663,
>clock=d07eb164.b28498f0  Fri, Nov  5 2010 16:37:56.697, peer=62406, tc=6,
>mintc=3, offset=102.342, frequency=0.000, sys_jitter=9.546,
>clk_jitter=36.183, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051637, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    6   16  377    0.000   82.051   3.738
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
> psp-deb1.ntp.or 192.168.4.22     3 u   28   64    7    0.243  100.014   8.534
>*psp-fb1.ntp.org 204.123.2.5      2 u   25   64    7    0.385  102.342   9.546
> psp1.ntp.org    12.142.174.97    3 u  160   64    4    0.485   85.442   0.151
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=3,
>precision=-19, rootdelay=1.420, rootdisp=103.842, refid=146.144.108.74,
>reftime=d07eb29e.a9e351d4  Fri, Nov  5 2010 16:43:10.663,
>clock=d07eb2bd.23cc96d4  Fri, Nov  5 2010 16:43:41.139, peer=62406, tc=6,
>mintc=3, offset=80.164, frequency=236.465, sys_jitter=12.422,
>clk_jitter=32.322, clk_wander=0.000, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051637, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l   15   16  377    0.000   63.890   2.868
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>+psp-deb1.ntp.or 192.168.4.22     3 u   36   64  377    0.345   81.991  11.714
>*psp-fb1.ntp.org 216.218.192.202  2 u   31   64  377    0.306   84.493  11.843
>+psp1.ntp.org    12.142.174.97    3 u   31   64  237    0.496   78.337   9.533
>hart at psp-fb2> Script started on Fri Nov  5 16:53:42 2010
> ]2;psp-fb2:~/adjtime_rate  ]1;hart at psp-fb2 hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=4,
>precision=-19, rootdelay=1.607, rootdisp=128.650, refid=15.67.247.104,
>reftime=d07eb476.a9fbccd5  Fri, Nov  5 2010 16:51:02.663,
>clock=d07eb51e.975640b1  Fri, Nov  5 2010 16:53:50.591, peer=62405, tc=6,
>mintc=3, offset=-6.418, frequency=236.076, sys_jitter=28.543,
>clk_jitter=30.786, clk_wander=0.138, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051637, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l   15   16  377    0.000  -96.947  11.791
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>*psp-deb1.ntp.or 192.168.4.22     3 u    6   64  377    0.218  -58.622  26.422
>+psp-fb1.ntp.org 127.67.113.92    2 u    6   64  377    0.280  -76.583  40.485
>+psp1.ntp.org    12.142.174.97    3 u    6   64  377    0.405  -63.732  25.616
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=3,
>precision=-19, rootdelay=0.974, rootdisp=144.729, refid=146.144.108.74,
>reftime=d07eb716.a9fca2b7  Fri, Nov  5 2010 17:02:14.664,
>clock=d07eb7bf.180e900d  Fri, Nov  5 2010 17:05:03.093, peer=62406, tc=6,
>mintc=3, offset=-90.129, frequency=233.086, sys_jitter=28.119,
>clk_jitter=31.831, clk_wander=0.591, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051637, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l   16   16  376    0.000  -162.85   5.144
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>+psp-deb1.ntp.or 192.168.4.22     3 u   36   64  377    0.281  -146.54  25.197
>*psp-fb1.ntp.org 204.123.2.72     2 u   23   64  377    0.303  -116.83  17.159
>+psp1.ntp.org    12.142.174.97    3 u   29   64   77    0.374  -141.57  24.791
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=4,
>precision=-19, rootdelay=1.614, rootdisp=272.798, refid=15.67.247.104,
>reftime=d07eb93b.840eb083  Fri, Nov  5 2010 17:11:23.515,
>clock=d07eba20.7023251c  Fri, Nov  5 2010 17:15:12.438, peer=62405, tc=6,
>mintc=3, offset=-38.290, frequency=232.650, sys_jitter=25.983,
>clk_jitter=9.818, clk_wander=0.498, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051709, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    8   16  377    0.000  -84.851   8.491
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>*psp-deb1.ntp.or 192.168.4.22     3 u   26   64  177    0.210  -44.395  20.252
>+psp-fb1.ntp.org 127.67.113.92    2 u   31   64   37    0.295  -23.836  25.628
>+psp1.ntp.org    12.142.174.97    3 u   26   64  117    0.381  -64.143  32.241
>hart at psp-fb2> Script started on Fri Nov  5 17:26:10 2010
> ]2;psp-fb2:~/adjtime_rate  ]1;hart at psp-fb2 hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=3,
>precision=-19, rootdelay=1.425, rootdisp=162.859, refid=146.144.108.74,
>reftime=d07ebbdb.841d566a  Fri, Nov  5 2010 17:22:35.516,
>clock=d07ebcb9.37367c14  Fri, Nov  5 2010 17:26:17.215, peer=62406, tc=6,
>mintc=3, offset=-99.116, frequency=229.588, sys_jitter=18.246,
>clk_jitter=17.137, clk_wander=0.865, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051709, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    1   16  377    0.000  -149.34   5.396
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>+psp-deb1.ntp.or 192.168.4.22     3 u   18   64  177    0.219  -113.51  15.722
>*psp-fb1.ntp.org 216.218.192.202  2 u   19   64  377    0.296  -118.20  14.753
>+psp1.ntp.org    12.142.174.97    3 u   14   64  377    0.455  -136.50  23.187
>hart at psp-fb2> ntpq -crv -p
>
>associd=0 status=0613 leap_none, sync_ntp, 1 event, spike_detect,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=00, stratum=4,
>precision=-19, rootdelay=1.518, rootdisp=164.875, refid=15.67.247.104,
>reftime=d07ebdb5.83fb5eac  Fri, Nov  5 2010 17:30:29.515,
>clock=d07ebddc.18c0824b  Fri, Nov  5 2010 17:31:08.096, peer=62405, tc=6,
>mintc=3, offset=-99.116, frequency=229.588, sys_jitter=16.938,
>clk_jitter=17.137, clk_wander=0.865, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051709, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    4   16  377    0.000  -171.64   5.588
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
>*psp-deb1.ntp.or 192.168.4.22     3 u   16   64  377    0.282  -132.57  12.448
>+psp-fb1.ntp.org 216.218.192.202  2 u   16   64  377    0.296  -118.20  20.402
>+psp1.ntp.org    12.142.174.97    3 u   16   64  377    0.366  -146.41  13.836
>hart at psp-fb2> ntpq -crv -p -c "rv &5"
>
>associd=0 status=c018 leap_alarm, sync_unspec, 1 event, no_sys_peer,
>version="ntpd 4.2.7p78 at 1.2252-o Fri Nov  5 13:35:21 UTC 2010 (1)",
>processor="i386", system="FreeBSD/6.4-STABLE", leap=11, stratum=16,
>precision=-19, rootdelay=0.000, rootdisp=1.065, refid=STEP,
>reftime=00000000.00000000  Thu, Feb  7 2036  6:28:16.000,
>clock=d07ebe80.907745f3  Fri, Nov  5 2010 17:33:52.564, peer=0, tc=6,
>mintc=3, offset=0.000, frequency=229.588, sys_jitter=0.002,
>clk_jitter=0.002, clk_wander=0.809, host="psp-fb2.ntp.org",
>flags=0x80001, digest="md5", signature="md5WithRSAEncryption",
>update=201011051709, cert="psp-fb2 psp-fb2 0x0", until=201009061950
>     remote           refid      st t when poll reach   delay   offset  jitter
>==============================================================================
> GENERIC(0)      .GPS.            0 l    4   16   77    0.000  -53.373  23.782
> 192.168.4.255   .BCST.          16 B    -   64    0    0.000    0.000   0.002
> ff05::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002
> psp-deb1.ntp.or 192.168.4.22     3 u   66   64    1    0.280  -28.573   0.002
> psp-fb1.ntp.org 216.218.192.202  2 u   49   64    1    0.313  -26.974   0.782
> psp1.ntp.org    12.142.174.97    3 u   49   64    1    0.349  -33.001   0.626
>associd=62406 status=7024 authenb, auth, reach, sel_reject, 2 events, reachable,
>srcadr=psp-fb1.ntp.org, srcport=123, dstadr=2001:4f8:fff7:1::28,
>dstport=123, leap=00, stratum=2, precision=-20, rootdelay=1.053,
>rootdisp=10.468, refid=216.218.192.202,
>reftime=d07ebc50.0a84a689  Fri, Nov  5 2010 17:24:32.041,
>rec=d07ebe4f.60a19824  Fri, Nov  5 2010 17:33:03.377, reach=001,
>unreach=1, hmode=3, pmode=4, hpoll=6, ppoll=6, headway=450,
>flash=402 pkt_bogus, peer_dist, keyid=123, offset=-26.974, delay=0.313,
>dispersion=3937.540, jitter=0.782, xleave=0.029,
>filtdelay=     0.37    0.31    0.00    0.00    0.00    0.00    0.00    0.00,
>filtoffset=  -27.76  -26.97    0.00    0.00    0.00    0.00    0.00    0.00,
>filtdisp=      0.00    0.08 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0
>hart at psp-fb2>
>  
>




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