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GET /api/patches/16387/?format=api
{ "id": 16387, "url": "http://patchwork.dpdk.org/api/patches/16387/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/1475657009-11139-1-git-send-email-jerin.jacob@caviumnetworks.com/", "project": { "id": 1, "url": "http://patchwork.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": "<1475657009-11139-1-git-send-email-jerin.jacob@caviumnetworks.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1475657009-11139-1-git-send-email-jerin.jacob@caviumnetworks.com", "date": "2016-10-05T08:43:29", "name": "[dpdk-dev,v2] doc: arm64: document DPDK application profiling methods", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "0b1b79f6827f67e1c850db639f2072aa05f6e9ca", "submitter": { "id": 305, "url": "http://patchwork.dpdk.org/api/people/305/?format=api", "name": "Jerin Jacob", "email": "jerin.jacob@caviumnetworks.com" }, "delegate": { "id": 1, "url": "http://patchwork.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "http://patchwork.dpdk.org/project/dpdk/patch/1475657009-11139-1-git-send-email-jerin.jacob@caviumnetworks.com/mbox/", "series": [], "comments": "http://patchwork.dpdk.org/api/patches/16387/comments/", "check": "pending", "checks": "http://patchwork.dpdk.org/api/patches/16387/checks/", "tags": {}, "related": [], "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 [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id CA26972FB;\n\tWed, 5 Oct 2016 10:44:08 +0200 (CEST)", "from NAM02-BL2-obe.outbound.protection.outlook.com\n\t(mail-bl2nam02on0048.outbound.protection.outlook.com [104.47.38.48])\n\tby dpdk.org (Postfix) with ESMTP id CD20C6CD8\n\tfor <dev@dpdk.org>; Wed, 5 Oct 2016 10:44:06 +0200 (CEST)", "from localhost.localdomain.localdomain (111.92.120.53) by\n\tBLUPR0701MB1714.namprd07.prod.outlook.com (10.163.85.140) with\n\tMicrosoft SMTP Server (version=TLS1_2,\n\tcipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id\n\t15.1.639.5; Wed, 5 Oct 2016 08:44:03 +0000" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=CAVIUMNETWORKS.onmicrosoft.com; s=selector1-cavium-com;\n\th=From:Date:Subject:Message-ID:Content-Type:MIME-Version;\n\tbh=jgpQ87wKCvp8wKpL5IzMD3iYHCrOiHfVK/ZUOz7gIkE=;\n\tb=AnBQ9y+jJGkOPK0KTJVex2U1svrOZGTAfYLTFWIXmerah2u4l/5KlEgSmvj4dh8nYYP6j3AUhB+gd1xCWJCRmxvED9p1dLJ3bpdv5ss+TORUOCsKZXbDy2YSvyK+9X83ysOoAtrGwEyg9KOB6EHJM97jK+kq5yweT3HKoRwAqZo=", "Authentication-Results": "spf=none (sender IP is )\n\tsmtp.mailfrom=Jerin.Jacob@cavium.com; ", "From": "Jerin Jacob <jerin.jacob@caviumnetworks.com>", "To": "<dev@dpdk.org>", "CC": "<thomas.monjalon@6wind.com>, <jianbo.liu@linaro.org>,\n\t<viktorin@rehivetech.com>, Jerin Jacob <jerin.jacob@caviumnetworks.com>", "Date": "Wed, 5 Oct 2016 14:13:29 +0530", "Message-ID": "<1475657009-11139-1-git-send-email-jerin.jacob@caviumnetworks.com>", "X-Mailer": "git-send-email 2.5.5", "In-Reply-To": "<1475577630-14318-1-git-send-email-jerin.jacob@caviumnetworks.com>", "References": "<1475577630-14318-1-git-send-email-jerin.jacob@caviumnetworks.com>", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-Originating-IP": "[111.92.120.53]", "X-ClientProxiedBy": "MA1PR01CA0040.INDPRD01.PROD.OUTLOOK.COM (10.164.116.140)\n\tTo\n\tBLUPR0701MB1714.namprd07.prod.outlook.com (10.163.85.140)", "X-MS-Office365-Filtering-Correlation-Id": "3627a53e-5f34-474d-fbef-08d3ecfbc3c5", "X-Microsoft-Exchange-Diagnostics": [ "1; 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PCL:0;\n\tRULEID:(6040176)(601004)(2401047)(8121501046)(5005006)(10201501046)(3002001);\n\tSRVR:BLUPR0701MB1714; BCL:0; PCL:0; RULEID:; SRVR:BLUPR0701MB1714; ", "X-Forefront-PRVS": "008663486A", "X-Forefront-Antispam-Report": "SFV:NSPM;\n\tSFS:(10009020)(4630300001)(6009001)(6069001)(7916002)(189002)(199003)(77096005)(6116002)(7846002)(6666003)(107886002)(7736002)(97736004)(76176999)(15975445007)(5660300001)(48376002)(50986999)(106356001)(101416001)(5009440100003)(4001430100002)(68736007)(19580395003)(50466002)(2351001)(66066001)(6916009)(189998001)(19580405001)(229853001)(47776003)(42882006)(2906002)(2950100002)(33646002)(15395725005)(36756003)(4326007)(110136003)(42186005)(305945005)(586003)(105586002)(81166006)(92566002)(50226002)(81156014)(8676002)(3846002)(5003940100001);\n\tDIR:OUT; SFP:1101; SCL:1; SRVR:BLUPR0701MB1714;\n\tH:localhost.localdomain.localdomain; FPR:; SPF:None; PTR:InfoNoRecords;\n\tMX:1; A:1; LANG:en; ", "Received-SPF": "None (protection.outlook.com: cavium.com does not designate\n\tpermitted sender hosts)", "SpamDiagnosticOutput": "1:99", "SpamDiagnosticMetadata": "NSPM", "X-OriginatorOrg": "caviumnetworks.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "05 Oct 2016 08:44:03.2640\n\t(UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "BLUPR0701MB1714", "Subject": "[dpdk-dev] [PATCH v2] doc: arm64: document DPDK application\n\tprofiling methods", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "patches and discussions about DPDK <dev.dpdk.org>", "List-Unsubscribe": "<http://dpdk.org/ml/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://dpdk.org/ml/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>\n---\nv2:\n-Addressed ARM64 specific review comments(Suggested by Thomas)\nhttp://dpdk.org/dev/patchwork/patch/16362/\n---\n doc/guides/prog_guide/profile_app.rst | 58 +++++++++++++++++++++++++++++++++++\n 1 file changed, 58 insertions(+)", "diff": "diff --git a/doc/guides/prog_guide/profile_app.rst b/doc/guides/prog_guide/profile_app.rst\nindex 3226187..9f1b7ee 100644\n--- a/doc/guides/prog_guide/profile_app.rst\n+++ b/doc/guides/prog_guide/profile_app.rst\n@@ -31,6 +31,14 @@\n Profile Your Application\n ========================\n \n+Introduction\n+------------\n+\n+The following sections describe the methods to profile DPDK applications on\n+different architectures.\n+\n+x86\n+~~~\n Intel processors provide performance counters to monitor events.\n Some tools provided by Intel can be used to profile and benchmark an application.\n See the *VTune Performance Analyzer Essentials* publication from Intel Press for more information.\n@@ -50,3 +58,53 @@ The main situations that should be monitored through event counters are:\n Refer to the\n `Intel Performance Analysis Guide <http://software.intel.com/sites/products/collateral/hpc/vtune/performance_analysis_guide.pdf>`_\n for details about application profiling.\n+\n+ARM64\n+~~~~~\n+\n+Perf\n+^^^^\n+ARM64 architecture provide performance counters to monitor events.\n+The Linux perf tool can be used to profile and benchmark an application.\n+In addition to the standard events, perf can be used to profile arm64 specific\n+PMU events through raw events(-e -rXX)\n+\n+Refer to the\n+`ARM64 specific PMU events enumeration <http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.100095_0002_04_en/way1382543438508.html>`_\n+\n+High-resolution cycle counter\n+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n+The default cntvct_el0 based rte_rdtsc() provides portable means to get wall\n+clock counter at user space. Typically it runs at <= 100MHz.\n+\n+The alternative method to enable rte_rdtsc() for high resolution\n+wall clock counter is through armv8 PMU subsystem.\n+The PMU cycle counter runs at CPU frequency, However, access to PMU cycle\n+counter from user space is not enabled by default in the arm64 linux kernel.\n+It is possible to enable cycle counter at user space access\n+by configuring the PMU from the privileged mode (kernel space).\n+\n+by default rte_rdtsc() implementation uses portable cntvct_el0 scheme.\n+Application can choose the PMU based implementation with\n+CONFIG_RTE_ARM_EAL_RDTSC_USE_PMU\n+\n+Find below the example steps to configure the PMU based cycle counter on an\n+armv8 machine.\n+\n+.. code-block:: console\n+\n+ git clone https://github.com/jerinjacobk/armv8_pmu_cycle_counter_el0\n+ cd armv8_pmu_cycle_counter_el0\n+ make\n+ sudo insmod pmu_el0_cycle_counter.ko\n+ cd $DPDK_DIR\n+ make config T=arm64-armv8a-linuxapp-gcc\n+ echo \"CONFIG_RTE_ARM_EAL_RDTSC_USE_PMU=y\" >> build/.config\n+ make\n+\n+.. warning::\n+\n+ The PMU based scheme is useful for high accuracy performance profiling with\n+ rte_rdtsc(). However, This method can not be used in conjunction with Linux\n+ userspace profiling tools like perf as this scheme alters the PMU registers\n+ state.\n", "prefixes": [ "dpdk-dev", "v2" ] }