From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 6F95D1B5D2 for ; Thu, 21 Jun 2018 16:29:07 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Jun 2018 07:29:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,252,1526367600"; d="scan'208";a="65141601" Received: from rnicolau-mobl.ger.corp.intel.com (HELO [10.237.221.82]) ([10.237.221.82]) by fmsmga004.fm.intel.com with ESMTP; 21 Jun 2018 07:28:59 -0700 To: David Hunt , dev@dpdk.org References: <20180607073705.32895-2-david.hunt@intel.com> <20180621132414.39047-1-david.hunt@intel.com> From: Radu Nicolau Message-ID: <729e7d13-7f92-fafe-1d9e-5ed9c0389099@intel.com> Date: Thu, 21 Jun 2018 15:28:58 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 MIME-Version: 1.0 In-Reply-To: <20180621132414.39047-1-david.hunt@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Subject: Re: [dpdk-dev] [PATCH v2 0/8] examples/vm_power: 100% Busy Polling X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Jun 2018 14:29:07 -0000 On 6/21/2018 2:24 PM, David Hunt wrote: > This patch set adds the capability to do out-of-band power > monitoring on a system. It uses a thread to monitor the branch > counters in the targeted cores, and calculates the branch ratio > if the running code. > > If the branch ratop is low (0.01), then > the code is most likely running in a tight poll loop and doing > nothing, i.e. receiving no packets. In this case we scale down > the frequency of that core. > > If the branch ratio is higher (>0.01), then it is likely that > the code is receiving and processing packets. In this case, we > scale up the frequency of that core. > > The cpu counters are read via /dev/cpu/x/msr, so requires the > msr kernel module to be loaded. Because this method is used, > the patch set is implemented with one file for x86 systems, and > another for non-x86 systems, with conditional compilation in > the Makefile. The non-x86 functions are stubs, and do not > currently implement any functionality. > > The vm_power_manager app has been modified to take a new parameter > --core-list or -l > which takes a list of cores in a comma-separated list format, > e.g. 1,3,5-7,9, which resolvest to a core list of 1,3,5,6,7,9 > These cores will then be enabled for oob monitoring. When the > OOB monitoring thread starts, it reads the branch hits/miss > counters of each monitored core, and scales up/down accordingly. > > The guest_cli app has also been modified to allow sending of a > policy of type BRANCH_RATIO where all of the cores included in > the policy will be monitored by the vm_power_manager oob thread. > > v2 changes: > * Add the guest_cli patch into this patch set, including the > ability to set the policy to BRANCH_RATIO. > http://patches.dpdk.org/patch/40742/ > * When vm_power_manger receives a policy with type BRANCH_RATIO, > add the relevant cores to the monitoring thread. > > [1/8] examples/vm_power: add check for port count > [2/8] examples/vm_power: add core list parameter > [3/8] examples/vm_power: add oob monitoring functions > [4/8] examples/vm_power: allow greater than 64 cores > [5/8] examples/vm_power: add thread for oob core monitor > [6/8] examples/vm_power: add port-list to command line > [7/8] examples/vm_power: add branch ratio policy type > [8/8] examples/vm_power: add cli args to guest app > Series Acked-by: Radu Nicolau