Hi there!
I think I have a problem with the system time, which is considerable too slow.
It looses about 3 seconds every 20 minutes (i.e. ~10 secs/hour or 4 minutes
per day). This seems to be too much for ntp to compensate.
When I start ntp, I get frequent "time reset" messages in the log:
2009-10-25T03:38:35.738758+01:00 poseidon ntpd[5227]: synchronized to
131.130.251.107, stratum 1
2009-10-25T03:47:11.691165+01:00 poseidon ntpd[5227]: time reset +2.952038 s
2009-10-25T03:51:15.669040+01:00 poseidon ntpd[5227]: synchronized to
LOCAL(0), stratum 10
2009-10-25T03:51:41.690598+01:00 poseidon ntpd[5227]: synchronized to
131.130.251.107, stratum 1
2009-10-25T04:06:49.633882+01:00 poseidon ntpd[5227]: time reset +2.943313 s
2009-10-25T04:10:14.612358+01:00 poseidon ntpd[5227]: synchronized to
LOCAL(0), stratum 10
2009-10-25T04:11:20.612348+01:00 poseidon ntpd[5227]: synchronized to
131.130.251.107, stratum 1
I've also tried to start ntpd with "--slew" option, which results in
2009-10-26T08:36:20.171483+01:00 poseidon ntpd[21666]: frequency error 733 PPM
exceeds tolerance 500 PPM
2009-10-26T08:40:25.167171+01:00 poseidon ntpd[21666]: frequency error 737 PPM
exceeds tolerance 500 PPM
2009-10-26T08:47:05.169388+01:00 poseidon ntpd[21666]: synchronized to
78.41.115.216, stratum 2
2009-10-26T08:47:05.169492+01:00 poseidon ntpd[21666]: frequency error 740 PPM
exceeds tolerance 500 PPM
2009-10-26T08:47:30.168263+01:00 poseidon ntpd[21666]: frequency error 740 PPM
exceeds tolerance 500 PPM
2009-10-26T08:50:42.168643+01:00 poseidon ntpd[21666]: frequency error 742 PPM
exceeds tolerance 500 PPM
2009-10-26T08:58:09.172397+01:00 poseidon ntpd[21666]: synchronized to
80.64.132.152, stratum 2
...
The next thing I've tried is to change the internal clocksource. The original
setting was
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
hpet
I've changed it to "acpi_pm" using
echo "acpi_pm"
>/sys/devices/system/clocksource/clocksource0/current_clocksource
but this doesn't seem to have any effect on the drift.
I'd like to use this machine as master time server for my local network, but
this is useless with such problems.
Thanks in advance for any suggestions
Alex
ps: ntp.conf contains (comments stripped)
server pool.ntp.org
server 0.gentoo.pool.ntp.org
server 1.gentoo.pool.ntp.org
server 2.gentoo.pool.ntp.org
server 3.gentoo.pool.ntp.org
driftfile /var/lib/ntp/ntp.drift
restrict default nomodify nopeer
restrict 127.0.0.1
restrict 192.168.0.0 mask 255.255.0.0 nomodify nopeer notrap
