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

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Date:	Thu, 30 Jun 2016 09:57:28 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Borislav Petkov <bp@...en8.de>,
	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 Wed, 2016-06-29 at 19:16 +0200, Borislav Petkov wrote:

> 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

I met that too when testing, but only on my 8 socket box for whatever
reason.  Putting tip back on the box and poking a bit while I beat up
rt kernels elsewhere, cs_nsec: 167001172874 wd_nsec: 0.  (poke++)

	-Mike