* clocksource watchdog false detection
@ 2017-01-18 0:47 Yinghai Lu
2017-01-18 9:14 ` Thomas Gleixner
0 siblings, 1 reply; 2+ messages in thread
From: Yinghai Lu @ 2017-01-18 0:47 UTC (permalink / raw)
To: Thomas Gleixner, john stultz; +Cc: Linux Kernel Mailing List
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: clocksource watchdog false detection
2017-01-18 0:47 clocksource watchdog false detection Yinghai Lu
@ 2017-01-18 9:14 ` Thomas Gleixner
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Gleixner @ 2017-01-18 9:14 UTC (permalink / raw)
To: Yinghai Lu; +Cc: Linux Kernel Mailing List, John Stultz, x86, Peter Zijlstra
On Tue, 17 Jan 2017, Yinghai Lu wrote:
> 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?
When that happens then something prevented the expiry of the watchdog timer
for more than 4.5 seconds.
So instead of blaming the messenger, you should fix that problem.
Thanks,
tglx
^ permalink raw reply [flat|nested] 2+ messages in thread
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