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[ { "id": 115404, "web_url": "https://patches.dpdk.org/comment/115404/", "msgid": "<448ae078-47d7-0287-7fc9-63d8d026664f@intel.com>", "list_archive_url": "https://inbox.dpdk.org/dev/448ae078-47d7-0287-7fc9-63d8d026664f@intel.com", "date": "2020-07-07T17:47:21", "subject": "Re: [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in\n throughput calculation", "submitter": { "id": 324, "url": "https://patches.dpdk.org/api/people/324/?format=api", "name": "Ferruh Yigit", "email": "ferruh.yigit@intel.com" }, "content": "On 7/7/2020 12:32 AM, Honnappa Nagarahalli wrote:\n> The throughput calculation requires a counter that measures\n> passing of time. However, the kernel saves and restores the PMU\n> state when a thread is unscheduled and scheduled. This ensures\n> that the PMU cycles are not counted towards a thread that is\n> not scheduled. Hence, when RTE_ARM_EAL_RDTSC_USE_PMU is enabled,\n> the PMU cycles do not represent the passing of time.\n> This results in incorrect calculation of throughput numbers.\n> Use clock_gettime system call to calculate the time passed since\n> last call.\n> \n> Bugzilla ID: 450\n> Fixes: 0e106980301d (\"app/testpmd: show throughput in port stats\")\n> Cc: zhihong.wang@intel.com\n> Cc: stable@dpdk.org\n> \n> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>\n> Reviewed-by: Phil Yang <phil.yang@arm.com>\n> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\n> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>\n> Tested-by: Phil Yang <phil.yang@arm.com>\n> Tested-by: Ali Alnubani <alialnu@mellanox.com>\n\nSeries applied to dpdk-next-net/master, thanks.", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id EC984A00BE;\n\tTue, 7 Jul 2020 19:47:29 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 838EF1DEB0;\n\tTue, 7 Jul 2020 19:47:29 +0200 (CEST)", "from mga11.intel.com (mga11.intel.com [192.55.52.93])\n by dpdk.org (Postfix) with ESMTP id 84D7C1DEAF;\n Tue, 7 Jul 2020 19:47:27 +0200 (CEST)", "from orsmga003.jf.intel.com ([10.7.209.27])\n by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 07 Jul 2020 10:47:26 -0700", "from fyigit-mobl.ger.corp.intel.com (HELO [10.213.248.101])\n ([10.213.248.101])\n by orsmga003.jf.intel.com with ESMTP; 07 Jul 2020 10:47:22 -0700" ], "IronPort-SDR": [ "\n 2BKoJJ0p9IKoPusjbYM4tL0VNNXFcfCLM/ifX9jgDcNU32m6FXkBA0Uu0T9spxo8xm18G7cb3P\n 4q+xWFQTqnwg==", "\n 3q1hPC3EiTYOyHQ8bvzWUDaZpxnN2/sxZHeRiYgka0CzguYOcxGz74/9RIxXudatdkqWXUVVow\n yvL7dr5WH3Fg==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6000,8403,9675\"; a=\"145777225\"", "E=Sophos;i=\"5.75,324,1589266800\"; d=\"scan'208\";a=\"145777225\"", "E=Sophos;i=\"5.75,324,1589266800\"; d=\"scan'208\";a=\"279679755\"" ], "X-Amp-Result": "SKIPPED(no attachment in message)", "X-Amp-File-Uploaded": "False", "X-ExtLoop1": "1", "To": "Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>, dev@dpdk.org,\n alialnu@mellanox.com, orgerlitz@mellanox.com, wenzhuo.lu@intel.com,\n beilei.xing@intel.com, bernard.iremonger@intel.com", "Cc": "hemant.agrawal@nxp.com, jerinj@marvell.com, viacheslavo@mellanox.com,\n thomas@monjalon.net, ruifeng.wang@arm.com, phil.yang@arm.com, nd@arm.com,\n zhihong.wang@intel.com, stable@dpdk.org", "References": "<20200617144307.9961-1-honnappa.nagarahalli@arm.com>\n <20200706233231.25881-1-honnappa.nagarahalli@arm.com>", "From": "Ferruh Yigit <ferruh.yigit@intel.com>", "Autocrypt": "addr=ferruh.yigit@intel.com; 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charset=utf-8", "Content-Language": "en-US", "Content-Transfer-Encoding": "7bit", "Subject": "Re: [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in\n throughput calculation", "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 <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 <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "addressed": null } ]