linux-kernel - Re: [patch] Re: x86-tip tsc/tick gripage

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Message-ID: <1493389048.4387.7.camel@gmx.de>
Date:   Fri, 28 Apr 2017 16:17:28 +0200
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        "Paul E. McKenney" <paulmck@...ibm.com>,
        LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [patch] Re: x86-tip tsc/tick gripage

On Fri, 2017-04-28 at 10:45 +0200, Mike Galbraith wrote:

> Bah, nevermind.  I forgot to restore command line.

Well how 'bout that, it's not only old multi-socket boxen.  I just
reproduced on my i4790 desktop box.  Boot virgin tip to init 3 with
nowatchdog on command line, let box idle...

[  316.387436] clocksource: timekeeping watchdog on CPU7: Marking clocksource 'tsc' as unstable because the skew is too large:
[  316.393887] clocksource:                       'hpet' wd_now: e05e937 wd_last: 75c4e7c8 mask: ffffffff
[  316.400491] clocksource:                       'tsc' cs_now: 12134c63e80 cs_last: 8c0439451e mask: ffffffffffffffff
[  316.406899] sched_clock: Marking unstable (316377815439, 9598524)<-(316386903152, 510811)
[  316.413257] tsc: Marking TSC unstable due to clocksource watchdog
[  316.419223] clocksource: Switched to clocksource hpet