Date: Tue, 16 Aug 2016 13:20:02 +0200 From: "Martin S. Weber" <Ephaeton@gmx.net> To: freebsd-questions@freebsd.org Subject: Losing time like crazy (1s short per 10s) - how to investigate? Message-ID: <20160816112002.GA3083@hephaistos.local>
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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 13:12:52 ntpd[48425]: Command line: ntpd -q 16 Aug 13:12:52 ntpd[48425]: proto: precision = 0.230 usec (-22) 16 Aug 13:12:52 ntpd[48425]: leapsecond file ('/var/db/ntpd.leap-seconds.list'): good hash signature 16 Aug 13:12:52 ntpd[48425]: leapsecond file ('/var/db/ntpd.leap-seconds.list'): loaded, expire=2016-12-28T00:00:00Z last=2015-07-01T00:00:00Z ofs=36 16 Aug 13:12:52 ntpd[48425]: Listen and drop on 0 v6wildcard [::]:123 16 Aug 13:12:52 ntpd[48425]: Listen and drop on 1 v4wildcard 0.0.0.0:123 16 Aug 13:12:52 ntpd[48425]: Listen normally on 2 em0 10.10.1.79:123 16 Aug 13:12:52 ntpd[48425]: Listen normally on 3 lo0 [::1]:123 16 Aug 13:12:52 ntpd[48425]: Listen normally on 4 lo0 [fe80::1%2]:123 16 Aug 13:12:52 ntpd[48425]: Listen normally on 5 lo0 127.0.0.1:123 16 Aug 13:12:52 ntpd[48425]: Listening on routing socket on fd #26 for interface updates 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 13:13:04 ntpd[48426]: Command line: ntpd -q 16 Aug 13:13:04 ntpd[48426]: proto: precision = 0.229 usec (-22) 16 Aug 13:13:04 ntpd[48426]: leapsecond file ('/var/db/ntpd.leap-seconds.list'): good hash signature 16 Aug 13:13:04 ntpd[48426]: leapsecond file ('/var/db/ntpd.leap-seconds.list'): loaded, expire=2016-12-28T00:00:00Z last=2015-07-01T00:00:00Z ofs=36 16 Aug 13:13:04 ntpd[48426]: Listen and drop on 0 v6wildcard [::]:123 16 Aug 13:13:04 ntpd[48426]: Listen and drop on 1 v4wildcard 0.0.0.0:123 16 Aug 13:13:04 ntpd[48426]: Listen normally on 2 em0 10.10.1.79:123 16 Aug 13:13:04 ntpd[48426]: Listen normally on 3 lo0 [::1]:123 16 Aug 13:13:04 ntpd[48426]: Listen normally on 4 lo0 [fe80::1%2]:123 16 Aug 13:13:04 ntpd[48426]: Listen normally on 5 lo0 127.0.0.1:123 16 Aug 13:13:04 ntpd[48426]: Listening on routing socket on fd #26 for interface updates 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 -- and I have tmux with a clock running on various servers I'm logged in; And a chiming wall clock whose skew I check vs. my system clock. This is a new "feature" - I suspect an unfortunate interaction with FreeBSD-EN-16:13.vmbus. Running ntpd or not doesn't make a difference, interestingly, I'm still losing time even with ntpd on (above example is with ntpd not running). How can I investigate what might be the source of the problem? What info can I give that might help more informed people jump to the correct conclusion what's off? Here's what I've lost since starting to write this email: 16 Aug 13:17:58 ntpd[48461]: Listening on routing socket on fd #26 for interface updates 16 Aug 13:18:31 ntpd[48461]: ntpd: time set +32.207535 s ntpd: time set +32.207535s This can't be right. TIA, -Martin
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