From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1434929AbdDZJAi (ORCPT ); Wed, 26 Apr 2017 05:00:38 -0400 Received: from mout.gmx.net ([212.227.15.15]:56776 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1432129AbdDZI6Y (ORCPT ); Wed, 26 Apr 2017 04:58:24 -0400 Message-ID: <1493197062.21594.8.camel@gmx.de> Subject: Re: x86-tip tsc/tick gripage From: Mike Galbraith To: Ingo Molnar , "Paul E. McKenney" Cc: LKML , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Frederic Weisbecker Date: Wed, 26 Apr 2017 10:57:42 +0200 In-Reply-To: <1493195514.21594.5.camel@gmx.de> References: <1493193739.4412.30.camel@gmx.de> <1493194602.21594.4.camel@gmx.de> <20170426082137.koj7q3ftfqw3o22u@gmail.com> <1493195514.21594.5.camel@gmx.de> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:oVvEbzeh4CI1UrHoak4iGZ7dUiUjtUzM1rIWNKrpo4OfqC5z3so 9slr5GooGkzs/kqmlXJ3JNd9GLcfr4b9GUAhFHY5TOhurMWf3uNZqBaMda/8bnvIuKzSVU3 TfWvGyJt9ZCJrisXyISADdQfa+3g1O4HJtoHTXEy0ZgrdipwwhP/UvJSHkb9PAZZwml2vLu 0IJh4SwLmKqxL9xnHEg/A== X-UI-Out-Filterresults: notjunk:1;V01:K0:TdHFdC6cQww=:aLkDs0Q6mFCvlS71M1/Dcw AQdnSVdowshX+Au/u0RIyv017PAxPozPpVKajurqSMeOxqYH9jPJ51GedMKg6Qp77OOf7IX7H vjEpEvIJsrLpF/4j7NWyZgV8mUC82CsF/qgRvJTm5QikdideusmqWk5Ys9Zzx41WxH8d4RnTN bPBXrk1ttH1BejhwPXNKenmwhM90baAyYRz4eLV94W+dsozV5TGTaTNzlcRckx7uTuJgNUJzo BEdxvcgX3GXz9Cc6MFLsJEHJ3xBnKS97fFiKRth1qc6dOTNgffE03iXyOPNr2qcWTUIf65eJ/ jpF1LbQr57AJuH0QOi9vKY9q7lhbPuWo5QD/M5M6DZC68of27P8LbRKGPaAZF76hg55YCAnBL W4SgWn1WwrT9Vmv4GDazp84rOZlXMt0gDFBMURAP35u5RbfbyHpZCU1PknK09LCxbSabxFN4M 1qZ4DsP5p9zv9mUKTi9MQNr8oXRm2q44S/lnAvPz43gBAbsKKAWHtj+TVG7q1M117naXIacJs aOWY7/EpPaY3cGH7T6Hjm8I0F/oX++v+nPvEcQEQUnYQQf17i33PmCsHsI9BamCvRA63PLpo2 OZfs6lrVafM18GMuMGN40M/dNZyfRDwc/U5j2k1yGF2134mTl5bRo+eirXCGhtKqt+TnyvV5K m5hHySIMRIkRMMZQazPp9aGR/++kgLmE5s+hR7STQR5HNicU2myp14beGhnFwSBG3EVqAQ5hq YQ5sQaxNuxKGMnnTQVhlzFOHKC6QLE4l68htiRSDIDEBUS4s5OW+cisuWFemzuUbi+Nu5CDUO DmxWxOf Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2017-04-26 at 10:31 +0200, Mike Galbraith wrote: > On Wed, 2017-04-26 at 10:21 +0200, Ingo Molnar wrote: > > > I have temporarily removed the current timers/urgent lineup from -tip: > > > > 098991fccfc7: nohz: Print more debug info in tick_nohz_stop_sched_tick() > > 22aa2ad45fd8: tick: Make sure tick timer is active when bypassing reprogramming > > d58bd60c773d: nohz: Fix again collision between tick and other hrtimers > > > > ... and have reintegrated tip:master, so it should be back to working I think. > > > > Does this solve the warning and the RCU stalls on your boxes? > > (both boxen building) (oh come on, boot already... zzz) 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 [ 349.192460] clocksource: timekeeping watchdog on CPU63: Marking clocksource 'tsc' as unstable because the skew is too large: [ 349.217756] clocksource: 'hpet' wd_now: 2bb0dad7 wd_last: 5d9ac241 mask: ffffffff [ 349.239021] clocksource: 'tsc' cs_now: d2413ebfc1c28 cs_last: d2387b328a38c mask: ffffffffffffffff [ 349.263525] sched_clock: Marking unstable (349228856508, 34664619)<-(351146178141, -1882657014) [ 349.283245] tsc: Marking TSC unstable due to clocksource watchdog [ 349.298075] clocksource: Switched to clocksource hpet