Losing time like crazy (1s short per 10s) - how to investigate?

[Matthew Seaman]

On 16/08/2016 12:27, Martin S. Weber wrote:
> On 2016-08-16 13:20:02, Martin S. Weber wrote:
>> > This is on FreeBSD 10.3-RELEASE-p7. I've only noticed this today,
>> > so I'd suspect this is post the p7 update (although I haven't
>> > investigated in that direction yet). I'm losing roughly a second
>> > per 10 seconds wall time.  Look at this crazy guy:
>> > 
>> > # ntpd -q ; sleep 10; ntpd -q                                                                
>> > 16 Aug 13:12:52 ntpd[48425]: ntpd 4.2.8p8-a (1): Starting
>> > (...)
>> > 16 Aug 13:12:54 ntpd[48425]: ntpd: time set +0.891676 s
>> > ntpd: time set +0.891676s
>> > 16 Aug 13:13:04 ntpd[48426]: ntpd 4.2.8p8-a (1): Starting
>> > (...)
>> > 16 Aug 13:13:06 ntpd[48426]: ntpd: time set +1.218972 s
>> > ntpd: time set +1.218972s
>> > 
>> > This is a CRAZY amount of skew. I've never noticed this before --
>> > (...)

> Note, with (kernel) p4 (userland) p6 (I freebsd-update'd rollback) 
> this does not happen:

Could you open a PR with the information you've included in this mail
thread please?  That sort of timing instability really shouldn't occur
as a consequence of a system upgrade.  It does seem to be peculiar to
your hardware though -- if everyone was seeing that there would be
ructions.  Big ructions.

	Cheers,

	Matthew


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