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