From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932416Ab3LWFM5 (ORCPT ); Mon, 23 Dec 2013 00:12:57 -0500 Received: from moutng.kundenserver.de ([212.227.126.171]:53000 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932310Ab3LWFMy (ORCPT ); Mon, 23 Dec 2013 00:12:54 -0500 Message-ID: <1387775559.5369.20.camel@marge.simpson.net> Subject: Re: [PATCH] rcu: Eliminate softirq processing from rcutree From: Mike Galbraith To: Sebastian Andrzej Siewior Cc: linux-rt-users@vger.kernel.org, Steven Rostedt , linux-kernel@vger.kernel.org, Thomas Gleixner , "Paul E. McKenney" Date: Mon, 23 Dec 2013 06:12:39 +0100 In-Reply-To: <1387773533.5369.16.camel@marge.simpson.net> References: <20131221193900.GA8427@linutronix.de> <1387681647.5412.25.camel@marge.simpson.net> <1387702631.5412.101.camel@marge.simpson.net> <1387773533.5369.16.camel@marge.simpson.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Provags-ID: V02:K0:7MKF4lvGECtkp58u+kTAmPUyLj6JYiFY5+17yunSmCp DIMKSrM7i6rSz68r63ZWf380/hwqVSQwoWpHOFrWAQ6lJX+1UB niOO41yMl6NbSlDguivm7B89Q4C7Jyr+zrjW45oWshQIxAM4za mnH/Xyo97DXEJDHCoqGaA7s8pYhAwUAakXp6nn8zgiKVcgfLQl vj+FJWKFzlBPVRoCF5mswOL4qwuE2k9K9yFVKLQNxpRx1uNzNa SK/cLY/OICfyZFFoed5S1BYIxE9zxibQmmntIg5R9Rcp/i5R2g Pn7EIR760pMn+rnIdpOBASzK95O4L3bqUhByVbCeZNEt7gOl/3 5iteijTUtwMhglINScRwACWtkXSS+Qow+0t/rVRWnNhbWRnEPi OgrGKtuiFOaQg== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2013-12-23 at 05:38 +0100, Mike Galbraith wrote: > On Sun, 2013-12-22 at 09:57 +0100, Mike Galbraith wrote: > > I'll let the box give > > RCU something to do for a couple days. No news is good news. > > Ho ho hum, merry christmas, gift attached. > > I'll beat on virgin -rt7, see if it survives, then re-apply RCU patch > and retest. This kernel had nohz_full enabled, along with Sebastian's > pending -rt fix for same, so RCU patch was not only not running solo, > box was running a known somewhat buggy config as well. Box was doing > endless tbench 64 when it started stalling fwiw. > > -Mike P.S. virgin -rt7 doing tbench 64 + make -j64 [ 97.907960] perf samples too long (3138 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 [ 103.047921] perf samples too long (5544 > 5000), lowering kernel.perf_event_max_sample_rate to 25000 [ 181.561271] perf samples too long (10318 > 10000), lowering kernel.perf_event_max_sample_rate to 13000 [ 184.243750] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 1.084 msecs [ 248.914422] perf samples too long (19719 > 19230), lowering kernel.perf_event_max_sample_rate to 7000 [ 382.116674] NOHZ: local_softirq_pending 10 [ 405.201593] perf samples too long (36824 > 35714), lowering kernel.perf_event_max_sample_rate to 4000 [ 444.704185] NOHZ: local_softirq_pending 08 [ 444.704208] NOHZ: local_softirq_pending 08 [ 444.704579] NOHZ: local_softirq_pending 08 [ 444.704678] NOHZ: local_softirq_pending 08 [ 444.705100] NOHZ: local_softirq_pending 08 [ 444.705980] NOHZ: local_softirq_pending 08 [ 444.705994] NOHZ: local_softirq_pending 08 [ 444.708315] NOHZ: local_softirq_pending 08 [ 444.710348] NOHZ: local_softirq_pending 08 [ 474.435582] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 1.096 msecs [ 475.994055] perf samples too long (63124 > 62500), lowering kernel.perf_event_max_sample_rate to 2000 Those annoying perf gripes are generic, not -rt.