Time of day

[Raul A. Gallegos]

Sorry, this came through as html code not text and pine didn't decode it
so I could not read the message.  Can you try to resend?  Best regards.

--- Raul A. Gallegos mailto:raul at asmodean.net http://www.asmodean.net
For millions of years, mankind lived just like the animals..  Then
something happened, which unleashed the power of our imagination...
We learned to talk...

On Tue, 24 Jul 2001, Rodney Clowdus wrote:

> Kansas City Linux User GroupI use the following tips for keeping accurate time and it works great!   Having a list of time servers always insure that someone is up and running.  Let me know what you think Matt.
> Rodney
> rclowdus at kcnet.com
>
>      Kansas City Linux User Group
>
>
> --------------------------------------------------------------------------------
>   a.. Home
>   b.. Mailing list
>   c.. Talks
>   d.. LUG Reviews
>   e.. Links
>   f.. Regional LUGs
> Ed's tips of the month
>   a.. Apr
>     a.. Time
>
> PC clocks are notoriously inaccurate.  So unstable that
> software has been written to try keeping them closer to
> the correct time.
>
> One way to get an intermittent adjustment is by use of the
> 'rdate' command.  It queries the specified hosts and sets
> the local system time, not the BIOS clock, to an average
> of the times seen on the remote systems.
>
> 'rdate -s ns1.kc.rr.com tick.wustl.edu clock.psu.edu' will
> set the system time from the three named servers.
>
> Running 'xntpd' is able to keep more accurate time and
> can maintain its time across an intermittent connection.
>
> Here is the start of the supplied /etc/ntp.conf file:
>
> ===========  Head of /etc/ntp.conf  ================
>
> #
> # Undisciplined Local Clock. This is a fake driver intended for backup
> # and when no outside source of synchronized time is available. The
> # default stratum is usually 3, but in this case we elect to use stratum
> # 0. Since the server line does not have the prefer keyword, this driver
> # is never used for synchronization, unless no other other
> # synchronization source is available. In case the local host is
> # controlled by some external source, such as an external oscillator or
> # another protocol, the prefer keyword would cause the local host to
> # disregard all other synchronization sources, unless the kernel
> # modifications are in use and declare an unsynchronized condition.
> #
> server  127.127.1.0     # local clock
> fudge   127.127.1.0 stratum 10
>
>
> ==================================================
> The above lines will allow the 'xntpd' daemon to keep running
> between dialins and then it will correct from the servers
> listed in the /etc/ntp.conf file.
>
> Using several servers allows for some being offline and
> still keep accurate time.
> ===========  Tail of /etc/ntp.conf  ==============
>
> server clock.psu.edu
> server clock.tricity.wsu.edu
> server dominator.eecs.harvard.edu
> server kuhub.cc.ukans.edu
> server libra.rice.edu
> server louie.udel.edu
> server ntp.css.gov
> server ntp.tmc.edu
> server ntp0.cornell.edu
> server ntp2.kansas.net
> server ntp1.cs.wisc.edu
> server ntp5.tamu.edu
> server ntp-0.cso.uiuc.edu
> server timex.cs.columbia.edu
>
>
> ==================================================
> My system is now on a cable modem so it is now always
> connected so it is more accurate than when I was dialup only
> but I am amazed at how accurate it can be over an unreliable
> medium like the Internet:
>
> [era at allenhome mp3]$ ntptime -r
> ntp_gettime() returns code 0 (OK)
>   time bca0ede0.75db1000  Thu, Apr 13 2000 20:07:44.460, (.460374),
>     maximum error 62784 us, estimated error 37984 us.
> ntptime=bca0ede0.75db1000 unixtime=38f66f60.460374 Thu Apr 13 20:07:44 2000
>  ntp_adjtime() returns code 0 (OK)
>     modes 0x0 (),
> offset 88 us, frequency -50.268 ppm, interval 4 s,
>     maximum error 62784 us, estimated error 37984 us,
>       status 0x1 (PLL),
> time constant 3, precision 1 us, tolerance 512 ppm,
>   pps frequency 0.000 ppm, stability 512.000 ppm, jitter 200 us,
>     intervals 0, jitter exceeded 0, stability exceeded 0, errors 0.
> [era at allenhome mp3]$
>
> Even the maximum error of 62.784 milliseconds is awesome !
>
>   b.. March
>     a.. bc
>
> bc -l
> 4*a(1)
> 3.14159265358979323844
> obase=2
> 4*a(1)
> 11.001001000011111101101010100010001000010110100011000010001101001010
> obase=16
> scale=40
> 4*a(1)
> 3.243F6A8885A308D313198A2E037073448
> ^D
>
>   c.. February
>     a.. ps
>     ps auxf to view related processes as a tree.
>     b.. setleds
>     setleds -D +num to set numlock on as a default.
>
>
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> Last modified on Thursday, 07-Jun-2001 11:46:48 CDT
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