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{
    "id": 77436,
    "url": "http://patches.dpdk.org/api/covers/77436/?format=api",
    "web_url": "http://patches.dpdk.org/project/dpdk/cover/20200911152938.8019-1-steven.lariau@arm.com/",
    "project": {
        "id": 1,
        "url": "http://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": "<20200911152938.8019-1-steven.lariau@arm.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/20200911152938.8019-1-steven.lariau@arm.com",
    "date": "2020-09-11T15:29:33",
    "name": "[0/5] lib/stack: improve lockfree C11 implementation",
    "submitter": {
        "id": 1862,
        "url": "http://patches.dpdk.org/api/people/1862/?format=api",
        "name": "Steven Lariau",
        "email": "steven.lariau@arm.com"
    },
    "mbox": "http://patches.dpdk.org/project/dpdk/cover/20200911152938.8019-1-steven.lariau@arm.com/mbox/",
    "series": [
        {
            "id": 12150,
            "url": "http://patches.dpdk.org/api/series/12150/?format=api",
            "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=12150",
            "date": "2020-09-11T15:29:33",
            "name": "lib/stack: improve lockfree C11 implementation",
            "version": 1,
            "mbox": "http://patches.dpdk.org/series/12150/mbox/"
        }
    ],
    "comments": "http://patches.dpdk.org/api/covers/77436/comments/",
    "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 DA957A04BB;\n\tFri, 11 Sep 2020 17:31:04 +0200 (CEST)",
            "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 5ECF31B13C;\n\tFri, 11 Sep 2020 17:31:04 +0200 (CEST)",
            "from foss.arm.com (foss.arm.com [217.140.110.172])\n by dpdk.org (Postfix) with ESMTP id 13EB5DE0\n for <dev@dpdk.org>; Fri, 11 Sep 2020 17:31:03 +0200 (CEST)",
            "from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14])\n by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6E0B21063;\n Fri, 11 Sep 2020 08:31:02 -0700 (PDT)",
            "from localhost.localdomain (unknown [10.57.10.210])\n by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D99E53F73C;\n Fri, 11 Sep 2020 08:31:00 -0700 (PDT)"
        ],
        "From": "Steven Lariau <steven.lariau@arm.com>",
        "To": "",
        "Cc": "dev@dpdk.org, nd@arm.com, dharmik.thakkar@arm.com,\n Steven Lariau <steven.lariau@arm.com>",
        "Date": "Fri, 11 Sep 2020 16:29:33 +0100",
        "Message-Id": "<20200911152938.8019-1-steven.lariau@arm.com>",
        "X-Mailer": "git-send-email 2.17.1",
        "Subject": "[dpdk-dev] [PATCH 0/5] lib/stack: improve lockfree C11\n\timplementation",
        "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>"
    },
    "content": "One implementation of the DPDK stack library is lockfree,\nbased on C11 memory model for atomics.\nSome of these atomic operations use unnecessary memory orders,\nthat can be relaxed.\nThis patch relax some of these operations in order to improve\nthe performance of the stack library.\n\nThe patch was tested on several architectures, to ensure that\nthe implementation is correct, and to measure performance.\nBelow are the results for a few architectures on multithread stack\nlockfree test.\nThe cycles count is the average number of cycles per item to perform\na bulk push / pop.\n\n$sudo ./builddir/app/dpdk-test\nRTE>>stack_lf_perf_autotest\n                              difference compared to main\nCycles count on ThunderX2\n 2 cores, bulk size =  8:           -15.85%\n 2 cores, bulk size = 32:           -04.56%\n 4 cores, bulk size =  8:           -05.00%\n 4 cores, bulk size = 32:           -04.35%\n16 cores, bulk size =  8:           -02.38%\n16 cores, bulk size = 32:           -01.88%\n\n                              difference compared to main\nCycles count on N1SDP\n 2 cores, batch size =  8:          +00.77%\n 2 cores, batch size = 32:          -16.00%\n\n                              difference compared to main\nCycles count on Skylake\n 2 cores, bulk size =  8:           -00.18%\n 2 cores, bulk size = 32:           -00.95%\n 4 cores, bulk size =  8:           -01.19%\n 4 cores, bulk size = 32:           +00.64%\n16 cores, bulk size =  8:           +01.20%\n16 cores, bulk size = 32:           +00.48%\n\nSteven Lariau (5):\n  lib/stack: fix inconsistent weak / strong cas\n  lib/stack: remove push acquire fence\n  lib/stack: remove redundant orderings for list->len\n  lib/stack: reload head when pop fails\n  lib/stack: remove pop cas release ordering\n\n lib/librte_stack/rte_stack_lf_c11.h | 18 +++++++-----------\n 1 file changed, 7 insertions(+), 11 deletions(-)"
}