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{ "id": 41540, "url": "https://patches.dpdk.org/api/covers/41540/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/cover/20180626092317.11031-1-david.hunt@intel.com/", "project": { "id": 1, "url": "https://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20180626092317.11031-1-david.hunt@intel.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20180626092317.11031-1-david.hunt@intel.com", "date": "2018-06-26T09:23:08", "name": "[0/9] examples/vm_power: 100% Busy Polling", "submitter": { "id": 342, "url": "https://patches.dpdk.org/api/people/342/?format=api", "name": "Hunt, David", "email": "david.hunt@intel.com" }, "mbox": "https://patches.dpdk.org/project/dpdk/cover/20180626092317.11031-1-david.hunt@intel.com/mbox/", "series": [ { "id": 235, "url": "https://patches.dpdk.org/api/series/235/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/list/?series=235", "date": "2018-06-26T09:23:08", "name": "examples/vm_power: 100% Busy Polling", "version": 1, "mbox": "https://patches.dpdk.org/series/235/mbox/" } ], "comments": "https://patches.dpdk.org/api/covers/41540/comments/", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@dpdk.org", "Delivered-To": "patchwork@dpdk.org", "Received": [ "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 145871B483;\n\tTue, 26 Jun 2018 11:23:33 +0200 (CEST)", "from mga04.intel.com (mga04.intel.com [192.55.52.120])\n\tby dpdk.org (Postfix) with ESMTP id 2810A1B483\n\tfor <dev@dpdk.org>; Tue, 26 Jun 2018 11:23:31 +0200 (CEST)", "from orsmga001.jf.intel.com ([10.7.209.18])\n\tby fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t26 Jun 2018 02:23:30 -0700", "from silpixa00399952.ir.intel.com (HELO\n\tsilpixa00399952.ger.corp.intel.com) ([10.237.223.64])\n\tby orsmga001.jf.intel.com with ESMTP; 26 Jun 2018 02:23:29 -0700" ], "X-Amp-Result": "SKIPPED(no attachment in message)", "X-Amp-File-Uploaded": "False", "X-ExtLoop1": "1", "X-IronPort-AV": "E=Sophos;i=\"5.51,274,1526367600\"; d=\"scan'208\";a=\"67785341\"", "From": "David Hunt <david.hunt@intel.com>", "To": "dev@dpdk.org", "Cc": "david.hunt@intel.com", "Date": "Tue, 26 Jun 2018 10:23:08 +0100", "Message-Id": "<20180626092317.11031-1-david.hunt@intel.com>", "X-Mailer": "git-send-email 2.17.1", "In-Reply-To": "<20180621132414.39047-2-david.hunt@intel.com>", "References": "<20180621132414.39047-2-david.hunt@intel.com>", "Subject": "[dpdk-dev] [0/9] 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 <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "This patch set adds the capability to do out-of-band power\nmonitoring on a system. It uses a thread to monitor the branch\ncounters in the targeted cores, and calculates the branch ratio\nif the running code.\n\nIf the branch ratop is low (0.01), then\nthe code is most likely running in a tight poll loop and doing\nnothing, i.e. receiving no packets. In this case we scale down\nthe frequency of that core.\n\nIf the branch ratio is higher (>0.01), then it is likely that\nthe code is receiving and processing packets. In this case, we\nscale up the frequency of that core.\n\nThe cpu counters are read via /dev/cpu/x/msr, so requires the\nmsr kernel module to be loaded. Because this method is used,\nthe patch set is implemented with one file for x86 systems, and\nanother for non-x86 systems, with conditional compilation in\nthe Makefile. The non-x86 functions are stubs, and do not\ncurrently implement any functionality.\n\nThe vm_power_manager app has been modified to take a new parameter\n --core-list or -l\nwhich takes a list of cores in a comma-separated list format,\ne.g. 1,3,5-7,9, which resolvest to a core list of 1,3,5,6,7,9\nThese cores will then be enabled for oob monitoring. When the\nOOB monitoring thread starts, it reads the branch hits/miss\ncounters of each monitored core, and scales up/down accordingly.\n\nThe guest_cli app has also been modified to allow sending of a\npolicy of type BRANCH_RATIO where all of the cores included in\nthe policy will be monitored by the vm_power_manager oob thread.\n\nv2 changes:\n * Add the guest_cli patch into this patch set, including the\n ability to set the policy to BRANCH_RATIO.\n http://patches.dpdk.org/patch/40742/\n * When vm_power_manger receives a policy with type BRANCH_RATIO,\n add the relevant cores to the monitoring thread.\n\nv3 changes:\n * Added a command line parameter to alloe changing of the\n default branch ratio threshold. can now use -b 0.3 or\n --branch-ratio=0.3 to set the ratio for scaling up/down.\n\n[1/9] examples/vm_power: add check for port count\n[2/9] examples/vm_power: add core list parameter\n[3/9] examples/vm_power: add oob monitoring functions\n[4/9] examples/vm_power: allow greater than 64 cores\n[5/9] examples/vm_power: add thread for oob core monitor\n[6/9] examples/vm_power: add port-list to command line\n[7/9] examples/vm_power: add branch ratio policy type\n[8/9] examples/vm_power: add cli args to guest app\n[9/9] examples/vm_power: make branch ratio configurable" }