[ntp:questions] Stability problem on PowerEdge (SuSE 9.3)
Till Wimmer
news-dfn at substring.ch
Sat Feb 24 17:03:56 UTC 2007
Hi there,
i try to settle some time accuracy in our office environment...
Our main server is running SuSE 9.3 on AMD64. I installed the xntp package from SuSE (Vers. 4.2.0a-35).
Hardware: DELL Power Edge 2850
uanme -a:
Linux office 2.6.11.4-21.15-smp #1 SMP Tue Nov 28 13:39:58 UTC 2006 x86_64 x86_64 x86_64 GNU/Linux
/etc/ntp.conf:
--- snip ---
driftfile /var/lib/ntp/drift/ntp.drift
server 127.127.1.0
fudge 127.127.1.0 stratum 13
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
disable auth
--- snap ---
Short after starting, everythings looks ok:
remote refid st t when poll reach delay offset jitter
==============================================================================
*typhoon.aput.ne 192.12.19.20 2 u 227 256 377 170.905 -14.600 5.776
+bitvalve.org 192.53.103.108 2 u 166 256 377 32.163 -15.190 4.488
+8.15.10.42 132.163.4.103 2 u 170 256 377 105.118 -11.706 3.857
-ns.oredin.net 193.190.230.66 2 u 179 256 277 141.835 36.960 17.438
LOCAL(0) LOCAL(0) 13 l 49 64 377 0.000 0.000 0.001
But after 3..5 hours all peers are rejected (ntpq> as) and LOCAL(0) is the sync source.
I checked the firewall, disabled all restrict settings, disabled chroot and running as unprivileged user, a.s.o.
Now i found that pps stability is always 512ppm and pll has a huge offset.
ntpdc> kern:
pll offset: 4294.95 s
pll frequency: 22.694 ppm
maximum error: 0.364061 s
estimated error: 0.017754 s
status: 0001 pll
pll time constant: 4
precision: 1e-06 s
frequency tolerance: 512 ppm
pps frequency: 0.000 ppm
pps stability: 512.000 ppm
pps jitter: 0.0002 s
calibration interval: 4 s
calibration cycles: 0
jitter exceeded: 0
stability exceeded: 0
calibration errors: 0
I set the hwclock -w and started fro scratch, but short after the offset was the same.
I can't believe that the clock of this server is this terribly inaccurate... IMHO it's "professional" hardware. At least it was
expensive ;)
Any help would be very much appreciated!
Till
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