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Re: ntpd and kernel message set_rtc_mmss: can't update



"Rob Brown-Bayliss" <uncertain genius gmail com> writes:
> [root localhost ~]# ntpq -p
>     remote           refid      st t when poll reach   delay   offset  jitter
> ==============================================================================
> mu-relay1.masse 192.5.41.40      2 u   16   64  177  170.570  -798.72 12760.3
> ns1.compass.net 128.250.36.3     2 u   14   64  177  112.739  -13008. 7668.06
> cobol.appello.n 128.250.37.2     2 u   14   64  177  162.234  -897.55 11922.0
> ntp.thistledown .GPS.            1 u   19   64  177  203.800  -3927.4 9253.24
> gen2.ihug.co.nz 130.217.76.49    2 u   14   64  177  140.795  -7057.9 7349.37

Actually that looks good as far as ntpd synch-ing to outside servers
goes.  The servers it is syncing to, or the network connection it is
syncing over, on the other hand suck big-time.  Notice the "offset"
fields all differ from one another by a very large number of
milliseconds.  I see an offset of 0.7 0.8 3.9 7 13 seconds!  No 3
servers seem to agree as to what time it really is.  Thats not good at
all.  If your network connection is really overloaded (with up to a 13
second delay in a packet), then ntp is going to have a very hard time
setting the time on your system.

The "reach" is really a bitfield that shifts ones from lsb to msb so
it should indicate how many of the last 8 packets it successfully got
back.  When ntpd starts expect that number to count as such: 1, 3, 7,
17, 37, 77, 177, 377.

The next thing to watch for is the first column in the ntpq -p output.
Eventually some +'s -'s and *'s will appear.  These are servers that
ntp has synced with or are potential candidates.  If it is doing that,
then all is ok.

> [root localhost ~]# ntpdate
> 23 Oct 06:15:35 ntpdate[3869]: no servers can be used, exiting

ntpdate when run from the command line needs the servers listed by
hand.  I don't know why it doesn't grab them from ntpd.conf as a
default, but it doesn't.  Just grab one or all the servers / peers
listed in your /etc/ntp.conf file.  

You won't be able to run ntpdate without the -d flag unless you stop
ntpd.  I wouldn't stop it.  I'd just let it run for a day and try to
get synced up.  The first time you run ntpd it will take a while as it
is tuning the ntp.drift file for you.  It may take 2-3 days for the
drift file to be adjusted.

-wolfgang
-- 
Wolfgang S. Rupprecht                http://www.wsrcc.com/wolfgang/


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