Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761635Ab3DCC5j (ORCPT ); Tue, 2 Apr 2013 22:57:39 -0400 Received: from mga02.intel.com ([134.134.136.20]:64790 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760710Ab3DCC5i (ORCPT ); Tue, 2 Apr 2013 22:57:38 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,397,1363158000"; d="scan'208";a="311502115" Message-ID: <515B9A7A.6030807@intel.com> Date: Wed, 03 Apr 2013 10:56:58 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130221 Thunderbird/17.0.3 MIME-Version: 1.0 To: Michael Wang CC: mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, akpm@linux-foundation.org, arjan@linux.intel.com, bp@alien8.de, pjt@google.com, namhyung@kernel.org, efault@gmx.de, morten.rasmussen@arm.com, vincent.guittot@linaro.org, gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, len.brown@intel.com, rafael.j.wysocki@intel.com, jkosina@suse.cz, clark.williams@gmail.com, tony.luck@intel.com, keescook@chromium.org, mgorman@suse.de, riel@redhat.com Subject: Re: [patch v3 0/8] sched: use runnable avg in load balance References: <1364873008-3169-1-git-send-email-alex.shi@intel.com> <515A877B.3020908@linux.vnet.ibm.com> <515A9859.6000606@intel.com> <515B97FF.2040409@linux.vnet.ibm.com> In-Reply-To: <515B97FF.2040409@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1064 Lines: 29 On 04/03/2013 10:46 AM, Michael Wang wrote: > | 15 GB | 16 | 45110 | | 48091 | > | 15 GB | 24 | 41415 | | 47415 | > | 15 GB | 32 | 35988 | | 45749 | +27.12% > > Very nice improvement, I'd like to test it with the wake-affine throttle > patch later, let's see what will happen ;-) > > Any idea on why the last one caused the regression? you can change the burst threshold: sysctl_sched_migration_cost, to see what's happen with different value. create a similar knob and tune it. + + if (cpu_rq(this_cpu)->avg_idle < sysctl_sched_migration_cost) + burst_this = 1; + if (cpu_rq(prev_cpu)->avg_idle < sysctl_sched_migration_cost) + burst_prev = 1; + BTW, what's the job thread behaviour of pgbench, guess it has lots of wakeup. what's the work and sleep ratio of pgbench? -- Thanks Alex -- 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/