Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753292AbbLCTev (ORCPT ); Thu, 3 Dec 2015 14:34:51 -0500 Received: from g1t6223.austin.hp.com ([15.73.96.124]:46613 "EHLO g1t6223.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752884AbbLCTeu (ORCPT ); Thu, 3 Dec 2015 14:34:50 -0500 Message-ID: <56609956.3030201@hpe.com> Date: Thu, 03 Dec 2015 14:34:46 -0500 From: Waiman Long User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.12) Gecko/20130109 Thunderbird/10.0.12 MIME-Version: 1.0 To: Mike Galbraith CC: Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, Yuyang Du , Paul Turner , Ben Segall , Morten Rasmussen , Scott J Norton , Douglas Hatch Subject: Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline References: <1449081710-20185-1-git-send-email-Waiman.Long@hpe.com> <1449081710-20185-3-git-send-email-Waiman.Long@hpe.com> <1449117148.3314.5.camel@gmail.com> In-Reply-To: <1449117148.3314.5.camel@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1271 Lines: 31 On 12/02/2015 11:32 PM, Mike Galbraith wrote: > On Wed, 2015-12-02 at 13:41 -0500, Waiman Long wrote: > >> By doing so, the perf profile became: >> >> 9.44% 0.00% java [kernel.vmlinux] [k] smp_apic_timer_interrupt >> 8.74% 0.01% java [kernel.vmlinux] [k] hrtimer_interrupt >> 7.83% 0.03% java [kernel.vmlinux] [k] tick_sched_timer >> 7.74% 0.00% java [kernel.vmlinux] [k] update_process_times >> 7.27% 0.03% java [kernel.vmlinux] [k] scheduler_tick >> 5.94% 1.74% java [kernel.vmlinux] [k] task_tick_fair >> 4.15% 3.92% java [kernel.vmlinux] [k] update_cfs_shares >> >> The %cpu time is still pretty high, but it is better than before. > Is that with the box booted skew_tick=1? > > -Mike > I haven't tried that kernel parameter. I will try it to see if it can improve the situation. BTW, will there be other undesirable side effects of using this other than the increased power consumption as said in the kernel-parameters.txt file? Cheers, Longman -- 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/