Date: Tue, 16 Aug 2016 12:33:47 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org, "Martin S. Weber" <Ephaeton@gmx.net> Subject: Re: Losing time like crazy (1s short per 10s) - how to investigate? Message-ID: <d663a118-6ca3-fc1d-abe8-0da66b232fdf@FreeBSD.org> In-Reply-To: <20160816112714.GA1241@hephaistos.local> References: <20160816112002.GA3083@hephaistos.local> <20160816112714.GA1241@hephaistos.local>
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From: Matthew Seaman <matthew@FreeBSD.org>
To: freebsd-questions@freebsd.org, "Martin S. Weber" <Ephaeton@gmx.net>
Message-ID: <d663a118-6ca3-fc1d-abe8-0da66b232fdf@FreeBSD.org>
Subject: Re: Losing time like crazy (1s short per 10s) - how to investigate?
References: <20160816112002.GA3083@hephaistos.local>
<20160816112714.GA1241@hephaistos.local>
In-Reply-To: <20160816112714.GA1241@hephaistos.local>
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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:
>> >=20
>> > # ntpd -q ; sleep 10; ntpd -q =
=20
>> > 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
>> >=20
>> > This is a CRAZY amount of skew. I've never noticed this before --
>> > (...)
> Note, with (kernel) p4 (userland) p6 (I freebsd-update'd rollback)=20
> 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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