Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753144AbaAXTqt (ORCPT ); Fri, 24 Jan 2014 14:46:49 -0500 Received: from www.linutronix.de ([62.245.132.108]:59219 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752675AbaAXTqr (ORCPT ); Fri, 24 Jan 2014 14:46:47 -0500 Date: Fri, 24 Jan 2014 20:46:42 +0100 From: Sebastian Andrzej Siewior To: Mike Galbraith Cc: linux-rt-users@vger.kernel.org, Steven Rostedt , linux-kernel@vger.kernel.org, Thomas Gleixner , "Paul E. McKenney" Subject: Re: [PATCH] rcu: Eliminate softirq processing from rcutree Message-ID: <20140124194642.GA29981@linutronix.de> 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> <1387775559.5369.20.camel@marge.simpson.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1387775559.5369.20.camel@marge.simpson.net> X-Key-Id: 97C4700B X-Key-Fingerprint: 09E2 D1F3 9A3A FF13 C3D3 961C 0688 1C1E 97C4 700B User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Mike Galbraith | 2013-12-23 06:12:39 [+0100]: >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 This is block >[ 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 and this is RX. Is your testcase heavy disk-io or heavy disk-io + network? Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/