On Saturday 08 September 2007 21:44, Andrew Junev wrote:
> Saturday, September 8, 2007, 5:42:37 PM, you wrote:
> > Dumb question - what kernel are the FC6 systems running, and what
> > kernel is the F7 system running? Could there be a problem on your
> > system with the new "tickless" kernels and ntpd?
>
> Fedora Core 6 uses 2.6.20-1.2962.fc6
> Fedora 7 uses 2.6.22.4-65.fc7
>
> I also thought the kernel might be a problem. But for some reason
> noone else has it. It makes me think it's something with the
> configuration. But in fact it's a clean install of Fedora 7 with all
> the option set to its default values (except for the firewall and
> selinux which are disabled) and just ntp turned on...
>
> Can it be a problem with my hardware (I mean motherboard)? Is there a
> way to trace it?
>
> Thanks!
I've spent quite a bit of time looking into this problem today, and there
appears to be some sort of problem with ntp on Fedora 7. My Fedora 7 is on a
machine that gets it's time from my other machine, which gets it's time from
the Internet. i've run ntpq> pe every few minutes, and the F7 machine gets
the time synchronized from the other machine, but never polls less than every
64 secs. it then loses the synch, and starts afresh. It eventually achieves a
"reach" of 377, and is synched again, but some minutes lates, again loses
synch.
I went into /etc/ntp.conf, commented out the 192.168.0.230 server line, and
uncommented the commented out default server lines. Stopped, and started the
ntp daemon, and got the same results. After some time synchronization is
lost.
By contrast, booting FC5 on the same machine, which has 192.168.0.230 as the
server line in /etc/ntp.conf, I have no problems. When it's synched it's
polling every 64 secs, and progressively polls at longer intervals, as below.
This is over about some 2hrs.
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
192.168.0.230 80.127.4.179 2 u 56 64 3 0.543 7201255 1.797
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
192.168.0.230 80.127.4.179 2 u 55 64 17 0.371 -3.387 1.807
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 51 64 177 0.351 -5.402 2.832
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 103 128 377 0.316 -18.440 4.938
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 119 128 377 0.316 -18.440 4.479
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 58 128 377 0.364 -23.597 0.662
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 27 128 377 0.376 -24.385 1.127
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 108 128 377 0.351 -22.874 1.609
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 7 128 377 0.351 -22.874 2.574
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 52 128 377 0.382 -20.714 2.112
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 170 256 377 0.382 -20.714 2.280
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 112 256 377 0.391 -17.659 3.253
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 139 256 377 0.359 -10.552 1.658
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 200 256 377 0.392 -7.807 1.354
ntpq> pe
remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.0.230 80.127.4.179 2 u 198 1024 377 0.480 5.336 1.668
ntpq>
The kernel I booted FC5 with is 2.6.17-1.2174_FC5, and the kernel I was using
on Fedora 7, was 2.6.22.6. A realtime kernel from planetccrma.
I know I'm not being of any help. Just some observations from my machines, but
there does appear to be some problem with NTP on Fedora 7 from my own
observations.
Sorry I can't offer a fix.
Nigel.
