Miroslav,
I ran the same test here on four different machines with the expected
results. These included Solaris on both SPARC and Intel machines, as
well as two FreeBSD machines. I tested with and without the kernel, with
initial offset 300 ms (including step correction) and 100 ms. I tested
with initial poll interval of 16 s and 64 s. At 16 s, the leftover
offset after frequency update was about half a millisecond within spec,
but this torqued the frequency about 2 PPM as expected. It settled down
within 1 PM within 20 m.
Bottom line; I cannot verify your experience.
Dave
Miroslav Lichvar wrote:
On Tue, Nov 02, 2010 at 01:29:14PM +0000, David L. Mills wrote:
This doesn't make any sense. Your data show the frequency set to 0.0
and the a series of clock steps after that. If this is with your
simulator, try it with the real machine. I have tested with three
machines herewith and without kernel and with no such problems.
I have now such test running on real hw as I got that suggestion on
#ntp too. But the result is the same, the frequency estimation is
~170ppm off, see the following log. It's running with "disable kernel"
and the kernel frequency was left as ntpd using kernel discipline set
it, so for the daemon loop the frequency offset would be close to 0.
Again, this is with 0.1s initial offset, zero frequency offset, 64s
polling interval and no drift file.
Nov 2 12:53:08 localhost ntpd[8526]: ntpd 4.2.7...@1.2307 Mon Nov 1 12:20:56
UTC 2010 (1)
Nov 2 12:53:08 localhost ntpd[8526]: proto: precision = 0.105 usec
Nov 2 12:53:08 localhost ntpd[8526]: Listen and drop on 0 v4wildcard 0.0.0.0
UDP 123
Nov 2 12:53:08 localhost ntpd[8526]: Listen and drop on 1 v6wildcard :: UDP 123
Nov 2 12:53:08 localhost ntpd[8526]: Listen normally on 2 lo 127.0.0.1 UDP 123
Nov 2 12:53:08 localhost ntpd[8526]: Listen normally on 3 br0 10.34.24.25 UDP
123
...
Nov 2 12:53:08 localhost ntpd[8526]: Listen normally on 10 lo ::1 UDP 123
Nov 2 12:53:08 localhost ntpd[8526]: 10.34.32.125 8011 81 mobilize assoc 11921
Nov 2 12:53:08 localhost ntpd[8526]: 0.0.0.0 c016 06 restart
Nov 2 12:53:08 localhost ntpd[8526]: 0.0.0.0 c012 02 freq_set ntpd 0.000 PPM
Nov 2 12:53:08 localhost ntpd[8526]: 0.0.0.0 c011 01 freq_not_set
Nov 2 12:53:09 localhost ntpd[8526]: 10.34.32.125 8024 84 reachable
Nov 2 12:56:21 localhost ntpd[8526]: 10.34.32.125 963a 8a sys_peer
Nov 2 12:56:21 localhost ntpd[8526]: 0.0.0.0 c614 04 freq_mode
Nov 2 13:01:44 localhost ntpd[8526]: 0.0.0.0 0612 02 freq_set ntpd 172.556 PPM
Nov 2 13:01:44 localhost ntpd[8526]: 0.0.0.0 0615 05 clock_sync
Nov 2 13:20:18 localhost ntpd[8526]: 0.0.0.0 0613 03 spike_detect -0.138466 s
Nov 2 13:29:04 localhost ntpd[8526]: 0.0.0.0 061c 0c clock_step -0.144407 s
Nov 2 13:29:04 localhost ntpd[8526]: 0.0.0.0 0615 05 clock_sync
Nov 2 13:29:05 localhost ntpd[8526]: 0.0.0.0 c618 08 no_sys_peer
Nov 2 13:29:05 localhost ntpd[8526]: 10.34.32.125 8044 84 reachable
Nov 2 13:35:47 localhost ntpd[8526]: 10.34.32.125 965a 8a sys_peer
Nov 2 13:44:45 localhost ntpd[8526]: 0.0.0.0 0613 03 spike_detect -0.152547 s
Nov 2 13:49:09 localhost ntpd[8526]: 0.0.0.0 061c 0c clock_step -0.177271 s
Nov 2 13:49:09 localhost ntpd[8526]: 0.0.0.0 0615 05 clock_sync
Nov 2 13:49:10 localhost ntpd[8526]: 0.0.0.0 c618 08 no_sys_peer
Nov 2 13:49:10 localhost ntpd[8526]: 10.34.32.125 8064 84 reachable
Nov 2 13:57:07 localhost ntpd[8526]: 10.34.32.125 967a 8a sys_peer
Nov 2 14:09:12 localhost ntpd[8526]: 0.0.0.0 0613 03 spike_detect -0.130677 s
Nov 2 14:15:45 localhost ntpd[8526]: 0.0.0.0 061c 0c clock_step -0.180840 s
Nov 2 14:15:45 localhost ntpd[8526]: 0.0.0.0 0615 05 clock_sync
Nov 2 14:15:46 localhost ntpd[8526]: 0.0.0.0 c618 08 no_sys_peer
Nov 2 14:15:46 localhost ntpd[8526]: 10.34.32.125 8084 84 reachable
Nov 2 14:21:22 localhost ntpd[8526]: 10.34.32.125 969a 8a sys_peer
Nov 2 14:32:30 localhost ntpd[8526]: 0.0.0.0 0613 03 spike_detect -0.131304 s
Nov 2 14:37:54 localhost ntpd[8526]: 0.0.0.0 061c 0c clock_step -0.155809 s
Nov 2 14:37:54 localhost ntpd[8526]: 0.0.0.0 0615 05 clock_sync
Nov 2 14:37:55 localhost ntpd[8526]: 0.0.0.0 c618 08 no_sys_peer
Nov 2 14:37:55 localhost ntpd[8526]: 10.34.32.125 80a4 84 reachable
Nov 2 14:49:16 localhost ntpd[8526]: 10.34.32.125 96ba 8a sys_peer
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