Tom Smith wrote:
> The high jitter numbers may just be because of that system's
> own instability.
>
> Have you checked the current drift rate? That might have gotten
> disrupted, especially if there was network activity involved in your
> experiment. Try the ntpq command "rv 0" or "ntpdc -c loopinfo" and
> look for the frequency. It should have an absolute value of under 100.
> If
> it's several hundred, you may need to re-initialize NTP by stopping
> it, deleting the drift file, and then restarting it. In any case,
> sample it periodically and see if it is oscillating.
>
> Any network related changes at that time, for example, on a switch?
> If it's fast ethernet, maybe you've renegotiated or otherwise
> acquired a mismatched speed/mode and you're now suffering packet
> losses. You might want to look at "netstat -e -s" and see if you have
> a significant number of errors or see if the "reach" output from
> "ntpq -p" looks different on this system than on others.
> -Tom
Tom,
Many thanks for your thoughtful suggestions.
It looks as if the drift is OK, at -64.911, but I will keep an eye on it.
Here is the full output just in case there's something else glaringly
obvious:
E:\>ntpq -c "rv 0" odin
status=46b4 leap_add_sec, sync_ntp, 11 events, event_peer/strat_chg,
version="ntpd 4.2.0 fr Oct 17 8:49:33 2003 (1)", processor="unknown",
system="WINDOWS/NT", leap=01, stratum=3, precision=-19,
rootdelay=62.583, rootdispersion=125.847, peer=62645, refid=192.168.0.1,
reftime=c73d5d1a.a4d239b4 Sun, Dec 4 2005 12:18:34.643, poll=7,
clock=c73d5f43.da3d1265 Sun, Dec 4 2005 12:27:47.852, state=4,
offset=18.583, frequency=-64.911, jitter=10.097, stability=0.028
There were no network changes I am aware of (it's just a small internal
network, run by me....), and I don't recognise anything significant in the
way of errors from the netstat command. I do wonder about:
IPv4 Statistics, Received Address Errors = 2683
UDP Statistics for IPv4, No Ports = 6006
The system had been up for about 40 minutes.
Any comments?
E:\>netstat -e -s
Interface Statistics
Received Sent
Bytes 651081749 37472592
Unicast packets 484130 282526
Non-unicast packets 3741 999
Discards 0 0
Errors 0 0
Unknown protocols 0
IPv4 Statistics
Packets Received = 487302
Received Header Errors = 0
Received Address Errors = 2683
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 14
Received Packets Delivered = 487288
Output Requests = 283475
Routing Discards = 0
Discarded Output Packets = 0
Output Packet No Route = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0
ICMPv4 Statistics
Received Sent
Messages 12 9
Errors 0 0
Destination Unreachable 0 1
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenches 0 0
Redirects 0 0
Echos 0 8
Echo Replies 12 0
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0
TCP Statistics for IPv4
Active Opens = 153
Passive Opens = 72
Failed Connection Attempts = 2
Reset Connections = 127
Current Connections = 20
Segments Received = 482918
Segments Sent = 281457
Segments Retransmitted = 5
UDP Statistics for IPv4
Datagrams Received = 1910
No Ports = 6006
Receive Errors = 0
Datagrams Sent = 1867
E:\>
Thanks,
David
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