[mdlug] 2 very different gigabyte motherboards not keeping good time

[Bob]

I'm also running a gigabyte MB and have not had any problems with NTP.
Running Debian Sid with default ntp.conf file.


grep -v '^#' /etc/ntp.conf | sort -u

driftfile /var/lib/ntp/ntp.drift
filegen clockstats file clockstats type day enable
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
restrict ::1
restrict 127.0.0.1
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery
server 0.debian.pool.ntp.org iburst
server 1.debian.pool.ntp.org iburst
server 2.debian.pool.ntp.org iburst
server 3.debian.pool.ntp.org iburst
statistics loopstats peerstats clockstats

Drift file contents: -44.509



Bob Dion

Cell 501-525-2183
Starline Photographic
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On 04/30/2014 10:32 PM, Dan Pritts wrote:
>
> On Apr 16, 2014, at 9:36 AM, Dan Pritts <danno at dogcheese.net> wrote:
>
>> Thanks for taking the time to reply.
>>
>> All this said, I started NTP again on monday, and the system has kept proper time.
>>
>> I suppose it’s possible that somehow I had an out-of-sync clock that wasn’t set
>> properly at boot time, and ntp hadn’t been able to catch up yet.  But, ntp starts
>> up with the -g option so that seems unlikely too.  Maybe the network didn’t
>> come up properly at first, or something.
>>
>> Piss me off.
>
> Nope, that wasn’t the problem.  It started to drift again.
>
> I’ve got more data, and a theory.
>
> 1) i’ve watched the jitter numbers and they are high.  I suspect this is due to a combination of random
> comcast crappiness, and the fact that I have lots of network activity on this system.
>
> I suspect this had something to do with NTP’s recalcitrance to set the clock.
>
> 2) I had decreased the polling frequency of a stratum 1 server that I poll at my former employer,
> just to avoid being too needy.
>
> I set it to minpoll 8, which is 256 (2^8) seconds.  i’d apparently done that with the pool.ntp.org servers too.
> However, i had a stratum 2 at umich with the defaults, and I’m pretty sure that in the past i’d tried multiple
> servers with defaults and some with higher minpoll values.
>
> Anyway,  I removed all the minpoll values, which seems to have helped a lot.  The clock is still drifting pretty
> badly, but NTP is keeping it in line.
>
> danno
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