clocksource watchdog false detection

From	Yinghai Lu <yinghai@kernel.org>
Newsgroups	linux.kernel
Subject	clocksource watchdog false detection
Date	2017-01-18 01:50 +0100
Message-ID	<t0MBP-5zP-11@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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one socket system with running cpu/memory stress test, got:

--
[45477.565642] timekeeping watchdog: Marking clocksource 'tsc' as
unstable, because the skew is too large:
[45477.565643]     'acpi_pm' wd_now: 32e642 wd_last: 71c8c5 mask: ffffff
[45477.565644]     'tsc' cs_now: 4b80842681e0 cs_last: 4a48ac7d5a0a
mask: ffffffffffffffff
[45477.623779] Switched to clocksource acpi_pm

so acpi_pm reading between two timer are wrapped.

When that happen, should just disable clocksource_watchdog instead?

Thanks

Yinghai

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clocksource watchdog false detection Yinghai Lu <yinghai@kernel.org> - 2017-01-18 01:50 +0100
  Re: clocksource watchdog false detection Thomas Gleixner <tglx@linutronix.de> - 2017-01-18 10:20 +0100

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