[Dovecot] Time jumped forwards

[Eric Shubert]

On 01/13/2011 09:01 PM, Ian B wrote:
> Running Dovecot 2.0.8 on 32bit Centos5.5. The machine is a VMWare ESX VM.
>
> I'm seeing a lot of warning messages in syslog as follows:
>
> 2011-01-14T11:45:37.315917+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 105 seconds
> 2011-01-14T11:46:00.598006+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:46:25.364405+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 105 seconds
> 2011-01-14T11:46:27.030658+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:46:49.712202+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:48:07.600748+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:48:23.195587+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:48:37.342804+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:48:42.671037+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
> 2011-01-14T11:48:45.903081+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 105 seconds
> 2011-01-14T11:48:49.001119+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 105 seconds
> 2011-01-14T11:48:58.935835+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 105 seconds
> 2011-01-14T11:49:15.046253+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 104 seconds
> 2011-01-14T11:49:16.842962+08:00 imap4 dovecot: imap: Warning: Time jumped forwards 106 seconds
>
> I've checked the clock settings in Centos and it all looks OK. NTP is running and not complaining about clock drift. Vmware recommend appending 'divider=10 clocksource=acpi_pm' kernel boot options to prevent timekeeping issues, which I've done.
>
> Has anyone else encountered this message? Is it something to be concerned about?
>
> Thanks,
> Ian.
>

See 
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1006427&sliceId=1&docTypeID=DT_KB_1_1&dialogID=23956052&stateId=1%200%2023952415 


In particular, see NTP Recommendations and VMware Tools bits at the bottom.

-- 
-Eric 'shubes'