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List:       gpsd-users
Subject:    [Gpsd-users] Your NTP Server Using A Garmin 18 LVC
From:       gem () rellim ! com (Gary E !  Miller)
Date:       2006-09-26 17:56:31
Message-ID: Pine.LNX.4.64.0609261047300.27977 () catbert ! rellim ! com
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Yo Tom!

Thanks for the succes report.  Please report to gpsd-users what fudge you
finally settle on.

On Tue, 26 Sep 2006, tom kayser wrote:

> I got it to work.  It doesn't work quite as well as yours, but it is stratum
> 1.

Several things to try.

First, run the baud rate as high as you can. In this case that should be
19.200.` That cuts the latency and jitter in the serial transfer part
by a factor of 4.

Second, run gpsd and ntpd at nice -20.  This helps somewhat on a CPU with
other work to do.

Third. do not run much else on the time server host.  If the cpu is working
when a PPS comes in then it will be delayed.

Fourth, wait a few days.  It takes days for ntpd to find the poper
loop constants for my chimer.

> After I figure out how, I'm going to try and join the pool.  Which pool
> do you think I should join.  I was thinking the us pool, since I live in the
> USA.  Are you in the pool?

I am not in a pool.  I just act as a client to some nearby high level
stratum 1s.  Then have a bunch of machines, both my and others, use me as
a stratum 2.

I tried to be a client with some pools, but sometimes you get a good/close
server and cometimes not.  I prefer to test the ntp hosts to know
what I am getting long term.

For an example of a bad time server, look at time.windows.com.  It is
always 20 or 30 mS off from any other ntpd server.

RGDS
GARY
- ---------------------------------------------------------------------------
Gary E. Miller Rellim 20340 Empire Blvd, Suite E-3, Bend, OR 97701
	gem at rellim.com  Tel:+1(541)382-8588

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