linux-kernel - clocksource watchdog false detection

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Message-ID: <CAE9FiQWEcLywTVFASoxTEPFfPaeQ8Mh6i0OrSzR3donfzcx3pQ@mail.gmail.com>
Date:   Tue, 17 Jan 2017 16:47:05 -0800
From:   Yinghai Lu <yinghai@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        john stultz <johnstul@...ibm.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: clocksource watchdog false detection

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