From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2997176AbdDZJaD (ORCPT ); Wed, 26 Apr 2017 05:30:03 -0400 Received: from mout.gmx.net ([212.227.17.20]:63022 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2995039AbdDZJTA (ORCPT ); Wed, 26 Apr 2017 05:19:00 -0400 Message-ID: <1493198295.21594.11.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 , "Paul E. McKenney" Date: Wed, 26 Apr 2017 11:18:15 +0200 In-Reply-To: <1493197062.21594.8.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> <1493197062.21594.8.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:w1n98213cjEyFaEk93PKKQ1lksPhZby6PtaE8sYtjh9RSKUkTN3 qBalygA3HumrZTH8FBBqHJ+7Yvv3Sxn3QqUVgncp8vBfgL6jKbbRBCu0zZUTHYscDr8b6IN Hl1XcaayyFigiYVCaBh/Nmd9Ne1BBzjT4j4CsSkqby/zQ79kItkD8uM3SSuAnEDwdoeE153 S280n6S3QbyFRKJt2cGcQ== X-UI-Out-Filterresults: notjunk:1;V01:K0:pht21Q0/wg4=:4uQjG37GSgXOHTWUbkXHVq QWddva7z9HaH5XrSH902UXNcd0BKTAlRUiAeij+wVvVSBAjsdSzKugDgQ7cyUIyWxvltqa058 jtIjRQ3zxuj+JokPdJKqWr2CEvrqKveC4Av85ASS+rNFFL4hXW730iuWX4OOwJLUIEOsHiHMr OBkUvkXxMxHvWq/6UQI3FRlbp/NPCFDJbEhe6RGuB8y3J+Z2kwPvQqIvYduecFYVpjkFwMyY2 sjOTQ3eaAwEP9cNiYJLqB1i0fUqJi+Fo6/CQqOaxFGiS/GzL/den67ghTthy/rGznWuDRXGZn 6GwcKej3wmzNoFWzwgBQXaYdsbEMIv+KKmSUKB08g75Bub8hfra9GnP1UKDjUBQ+pFAoSNjBx E4FOpGaEJqnXAZwXvSkYSV02sW1kPyv/TseNboxb9/GGp5wybRV18NEkiV59fdCTrjxGTxar6 8Y6NqK01LGKqZQKSykY02vej9+xHc2p0i3+UoPyQXMzy8AH9K+nMsY63yfUuOkK8R3HxmKxta lRA+QRmTVGbTTwrSCkrO5rlPYX2dpq7dV6oCVdEcs86DWHgUtdweV2CY/opVnn4mllRbOB4TT +Vh/1/ozzCMR5XUamrm/hW4CgXreifolFnzLecreg5FXXfXgJ+aYq+Qrb/VUHZrJjhmR8kejC 4fHypJr3XAY2WQe9aZc2xd8qtsf50vUYJWyRBMtxRIAUvmkkpU1qOx0Lcaafb3Yl9xxFVvglc 6zEZPBU1VnH2xY2Vpegjd/UX/7c9KYBTCRx4sb4c++pzHm1LDg+HAnbjRfM5J93e20wcJmEuB xoFn2GD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2017-04-26 at 10:57 +0200, Mike Galbraith wrote: > 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. Aw crap, and the DL980 RCU stalled while idling again. > [ 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