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Re: x86-tip tsc/tick gripage

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From Mike Galbraith <efault@gmx.de>
Newsgroups linux.kernel
Subject Re: x86-tip tsc/tick gripage
Date Wed, 26 Apr 2017 13:50:01 +0200
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X-Original-Cc Ingo Molnar <mingo@kernel.org>, "Paul E. McKenney" <paulmck@us.ibm.com>, LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>, Frederic Weisbecker <fweisbec@gmail.com>
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On Wed, 2017-04-26 at 12:26 +0200, Peter Zijlstra wrote:
> On Wed, Apr 26, 2017 at 10:57:42AM +0200, Mike Galbraith wrote:
> 
> > Both still lose their TSC.
> > 
> > [   11.982468] tsc: Refined TSC clocksource calibration: 2260.999 MHz
> > [   11.994275] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x20974a4d8bb, max_idle_ns: 440795246623 ns
> > [   13.064172] clocksource: Switched to clocksource tsc
> > [  240.247851] clocksource: timekeeping watchdog on CPU23: Marking clocksource 'tsc' as unstable because the skew is too large:
> > [  240.462501] clocksource:                       'tsc' cs_now: 108fe5be09f cs_last: b90a6a0676 mask: ffffffffffffffff
> > [  240.675057] tsc: Marking TSC unstable due to clocksource watchdog
> 
> 
> And they didn't use to? We don't typically write to TSC or TSC_ADJUST
> and thus would not cause such behaviour.

Nope.  The DL980 is my RT jitter test box, which I use all the time. 
 The other makes very spiffy jitter numbers when TSCs get synched up
(crap bios).. well used to before suse maintenance elves got around to
doing the BIOS replacement ;-/  (poor box, say hi to the goldfish)

	-Mike

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Thread

x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 10:20 +0200
  Re: x86-tip tsc/tick gripage Ingo Molnar <mingo@kernel.org> - 2017-04-26 10:30 +0200
    Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 10:40 +0200
      Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 11:10 +0200
        Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 11:50 +0200
        Re: x86-tip tsc/tick gripage Peter Zijlstra <peterz@infradead.org> - 2017-04-26 12:30 +0200
          Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 13:50 +0200
            Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 14:40 +0200
              Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 20:20 +0200
              Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-27 07:30 +0200
              [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() Mike Galbraith <efault@gmx.de> - 2017-04-29 18:10 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-29 20:10 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() Mike Galbraith <efault@gmx.de> - 2017-04-29 20:30 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-29 23:50 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() Mike Galbraith <efault@gmx.de> - 2017-04-30 03:30 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-30 05:50 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() Mike Galbraith <efault@gmx.de> - 2017-04-30 06:30 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-30 06:40 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-05-01 00:50 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() Thomas Gleixner <tglx@linutronix.de> - 2017-05-01 10:00 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-05-01 21:40 +0200
                Re: [patch] timer: Fix timers_update_migration(), and call it in  tmigr_init() Mike Galbraith <efault@gmx.de> - 2017-04-30 07:10 +0200
            [patch] Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-28 09:40 +0200
              Re: [patch] Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-28 10:50 +0200
                Re: [patch] Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-28 16:20 +0200
  Re: x86-tip tsc/tick gripage Mike Galbraith <efault@gmx.de> - 2017-04-26 10:30 +0200

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