[ntp:questions] ARRGH!!! I woke up to a 50 SECOND clock error.

Ron Frazier (NTP) timekeepingntplist at c3energy.com
Wed Mar 14 19:02:14 UTC 2012

On 3/14/2012 12:35 PM, David J Taylor wrote:
> "Ron Frazier (NTP)" <timekeepingntplist at c3energy.com> wrote in message 
> news:4F60BC0C.8040307 at c3energy.com...
> []
>> OK.  Here are the loopstats from another computer for 7 days (in the 
>> chart).  I don't have any peerstats for it.  It has the same server 
>> list.  One is preferred.  All servers are active.  Performance is no 
>> better.
>> http://dl.dropbox.com/u/9879631/TAZ%20loopstats%202012-03-07%20to%202012-03-14.jpg 
>> http://dl.dropbox.com/u/9879631/ntp.conf-TAZ
>> http://dl.dropbox.com/u/9879631/loopstats.20120313-TAZ
>> http://dl.dropbox.com/u/9879631/loopstats.20120314-TAZ
>> Sincerely,
>> Ron
> That's horrible, Ron!  Much worse than David Lord reports.  It makes 
> me want to ask a number of questions:

Hi David T,

NOW .... you understand.

I have 4 PC's connected to the LAN, plus my wife's work computer 3 days 
/ week, and on rare occasions my son's computer.  All are connected by 
wifi.  All do pretty mundane things: web browser, email, sometimes 
downloading patches, sometimes doing online backup.  My 4 are running 
NTPD.  3 run windows most of the time and dual boot into linux.  My 4th 
machine runs linux all the time.  When my wife is here, she does a 
remote desktop type of thing into her work system.  Two of my PC's are 
running Vista, one is running Windows 7.  Those three dual boot into 
Ubuntu 11.04 and the always linux machine runs Ubuntu 11.04.  Almost all 
the discussions I've had on this mailing list are for my Windows 7 machine.

The path out of my house is:

PC Wifi --> Wifi router --> wired router --> cable modem --> ISP -- internet

> - is this PC connected over wireless or wired?

Wifi G

> - what else is going through the router?  Someone else downloading 
> large files or using streaming audio or video?

See above.  Normally, no huge data hogs.

> - who else might be sharing your connection?

It's cable.  Who knows?  I also get cable TV and telephone through the 
same wire.

> - what type of service do you have?  Presumably not dial-up!  But what 
> speed?

Comcast Cable

Just tested it with speedtest.net
      Ping to near city: 91 ms, Download: 29.63 Mbps, Upload: 5.3 Mbps

> - having checked you speed, would you describe your connection as 
> "stable"?

See above for speed.  Generally, it's very stable.  However, for the 
purposes we're discussing, I think it's latencies and delays that are 
the problem.

As I mentioned in my reply to David L, I'm not concerned over trying to 
get stellar performance from internet servers.  I just want to get a 
good GPS server system running and use the internet servers as a backup.



> The quiet periods (e.g early Monday morning, Tuesday lunchtime) are 
> much nearer to what I would hope for, which makes me wonder whether 
> something is interfering with the connection outside those times.
> Cheers,
> David


(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such.  I don't always see new messages very quickly.  If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)

Ron Frazier
timekeepingdude AT c3energy.com

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