Amos Jeffries writes:
So the Squid logs can contain negative duration under exactly four
conditions:
...
4) NTP service adjusting the kernel clock backwards.
Since you say this is happening noticably often then its #4 and there is
something funky going on with NTP. The others are all at rare and
predictable times.
On 05.08.16 16:20, Henry S. Thompson wrote:
On closer investigation, you are exactly right. Here are the first two
columns (with the timestamp converted to human-readable form) for the
negative duration log lines starting at 0900 on the worst day on record,
3 years ago:
Tue 25 Jun 09:17:00 BST 2013 -281
[...]
Tue 25 Jun 11:16:59 BST 2013 -634
[...]
Tue 25 Jun 11:17:00 BST 2013 -164
and so it goes on.
There's a cron job on the 4 cache machines that runs every hour, and we
now know at exactly what time :-).
what cron job, ntpdate? if so, you should run ntpd instead. That one should
be able to manage time more precisely.
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