Bug 151994
| Summary: | ntp lost synchronisation - kernel tickadj | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 3 | Reporter: | RichardR <randjunk> |
| Component: | ntp | Assignee: | Miroslav Lichvar <mlichvar> |
| Status: | CLOSED INSUFFICIENT_DATA | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 3.0 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-11-24 12:27:51 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Is this still an issue? The ntpq output indicates a network problem. Delay to the system peer is high and reachability of the local servers isn't good. |
Description of problem: I run on SUN/AMD64 v20z machine under RHEL/WS3-kernel 2.4.21.xx an ntp service (ntp-4.1.2-4.EL3.1). Since these days I met a classic "ntp lost synchronisation" , but not so classic as I thought too in the beginning. Here is first my ntp.log file: ... 21 Mar 14:52:42 ntpd[2426]: time reset -0.450758 s 21 Mar 14:52:42 ntpd[2426]: synchronisation lost 21 Mar 15:14:11 ntpd[2426]: time reset 0.706603 s 21 Mar 15:14:11 ntpd[2426]: synchronisation lost 21 Mar 15:47:39 ntpd[2426]: time reset -0.716442 s 21 Mar 15:47:39 ntpd[2426]: synchronisation lost 21 Mar 16:08:07 ntpd[2426]: time reset 0.534158 s 21 Mar 16:08:07 ntpd[2426]: synchronisation lost 21 Mar 16:39:19 ntpd[2426]: time reset -0.316471 s 21 Mar 16:39:19 ntpd[2426]: synchronisation lost 22 Mar 00:41:55 ntpd[2426]: time reset -0.266574 s 22 Mar 00:41:55 ntpd[2426]: synchronisation lost 22 Mar 02:40:35 ntpd[2426]: time reset 0.259866 s 22 Mar 02:40:35 ntpd[2426]: synchronisation lost 22 Mar 13:57:43 ntpd[2412]: signal_no_reset: signal 17 had flags 4000000 22 Mar 13:57:43 ntpd[2406]: running as uid(38)/gid(38) euid(38)/egid(38). 22 Mar 14:01:02 ntpd[2406]: kernel time discipline status change 41 22 Mar 14:02:07 ntpd[2406]: kernel time discipline status change 1 23 Mar 13:39:19 ntpd[2406]: time reset -0.202650 s 23 Mar 13:39:19 ntpd[2406]: synchronisation lost 23 Mar 13:59:46 ntpd[2406]: time reset 0.276104 s 23 Mar 13:59:46 ntpd[2406]: synchronisation lost 23 Mar 14:40:25 ntpd[2406]: time reset -0.140437 s 23 Mar 14:40:25 ntpd[2406]: synchronisation lost 23 Mar 15:59:50 ntpd[2406]: time reset -0.148625 s 23 Mar 15:59:50 ntpd[2406]: synchronisation lost 23 Mar 18:31:57 ntpd[2406]: time reset 0.161298 s 23 Mar 18:31:57 ntpd[2406]: synchronisation lost 23 Mar 18:58:51 ntpd[2406]: time reset -0.133985 s 23 Mar 18:58:51 ntpd[2406]: synchronisation lost ... The ntpq -pn just looks normal to me... [root@katy root]# ntpq -pn remote refid st t when poll reach delay offset jitter ============================================================================== 127.127.1.0 127.127.1.0 12 l 63 64 377 0.000 0.000 7.812 192.168.2.101 0.0.0.0 16 u 129 1024 0 0.000 0.000 4000.00 192.168.12.100 .GPS. 1 u 92m 1024 240 7.812 -47.627 7.812 192.168.42.100 .GPS. 1 u 96m 1024 140 7.812 -48.103 7.812 *200.10.140.2 128.4.1.1 2 u 171 1024 377 99.855 -58.494 11.720 ---- /etc/ntp.conf: server ntpcdas # server ntpll #these 3 machines are our local ntp time server server ntpco # server tick.nap.com.ar server 127.127.1.0 fudge 127.127.1.0 stratum 12 driftfile /etc/ntp/drift logfile /var/log/ntp.log multicastclient broadcastdelay 0.008 authenticate no ---- /etc/ntp/step-tickers: ntpcdas ntpll ntpco tick.nap.com.ar ---- I have changed my ntp clients configurations to a mulitcast mode. And yet my servers still lost synchronisation and drift files with a tickadj=10000 always differ. I was told to change the tickadj to 9997 to slow down the kernel tick. This problem has already been noticied by the ntp forums. Version-Release number of selected component (if applicable): ntp-4.1.2-4.EL3.1 How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: ntp lost synchronisation every hour! Expected results: Additional info: