linux-kernel - Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large:

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Message-ID: <20160629171619.GA3691@pd.tnic>
Date:	Wed, 29 Jun 2016 19:16:19 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Peter Zijlstra <peterz@...radead.org>, x86-ml <x86@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because
 the skew is too large:

On Mon, Jun 27, 2016 at 10:06:31PM +0200, Borislav Petkov wrote:
> Hey Thomas,
> 
> Just started seeing this now during testing of Rafael's s/r fix:
> 
> [   24.973955] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large:
> [   24.987744] clocksource:                       'acpi_pm' wd_now: 2df835 wd_last: a6bb64 mask: ffffff
> [   24.999587] clocksource:                       'tsc' cs_now: 2bbe793d1e cs_last: 296e28763c mask: ffffffffffffffff
> [   25.013400] clocksource: Switched to clocksource acpi_pm
> 
> In the previous boot it was CPU1.

And here it is again:

...
[   15.720833] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   32.883077] clocksource: timekeeping watchdog on CPU1: Marking clocksource 'tsc' as unstable because the skew is too large:
[   32.896986] clocksource:                       'acpi_pm' wd_now: 8e147 wd_last: 531b43 mask: ffffff
[   32.908834] clocksource:                       'tsc' cs_now: 385f4b6d1e cs_last: 354328bcea mask: ffffffffffffffff
[   32.922293] clocksource: Switched to clocksource acpi_pm

-- 
Regards/Gruss,
    Boris.

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