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{
    "id": 47972,
    "url": "http://patchwork.dpdk.org/api/covers/47972/?format=api",
    "web_url": "http://patchwork.dpdk.org/project/dpdk/cover/20181109163917.16845-1-honnappa.nagarahalli@arm.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",
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        "list_archive_url_format": "https://inbox.dpdk.org/dev/{}",
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    },
    "msgid": "<20181109163917.16845-1-honnappa.nagarahalli@arm.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/20181109163917.16845-1-honnappa.nagarahalli@arm.com",
    "date": "2018-11-09T16:39:13",
    "name": "[0/4] hash: separate lf and rw lock lookup code paths",
    "submitter": {
        "id": 1045,
        "url": "http://patchwork.dpdk.org/api/people/1045/?format=api",
        "name": "Honnappa Nagarahalli",
        "email": "honnappa.nagarahalli@arm.com"
    },
    "mbox": "http://patchwork.dpdk.org/project/dpdk/cover/20181109163917.16845-1-honnappa.nagarahalli@arm.com/mbox/",
    "series": [
        {
            "id": 2343,
            "url": "http://patchwork.dpdk.org/api/series/2343/?format=api",
            "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=2343",
            "date": "2018-11-09T16:39:13",
            "name": "hash: separate lf and rw lock lookup code paths",
            "version": 1,
            "mbox": "http://patchwork.dpdk.org/series/2343/mbox/"
        }
    ],
    "comments": "http://patchwork.dpdk.org/api/covers/47972/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 930DD4C9F;\n\tFri,  9 Nov 2018 17:39:44 +0100 (CET)",
            "from foss.arm.com (foss.arm.com [217.140.101.70])\n\tby dpdk.org (Postfix) with ESMTP id 8525F4C94\n\tfor <dev@dpdk.org>; Fri,  9 Nov 2018 17:39:43 +0100 (CET)",
            "from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249])\n\tby usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8BABDA78;\n\tFri,  9 Nov 2018 08:39:42 -0800 (PST)",
            "from qc2400f-1.austin.arm.com (qc2400f-1.austin.arm.com\n\t[10.118.12.122])\n\tby usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id\n\t083D73F5BD; Fri,  9 Nov 2018 08:39:41 -0800 (PST)"
        ],
        "From": "Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>",
        "To": "bruce.richardson@intel.com,\n\tpablo.de.lara.guarch@intel.com",
        "Cc": "dev@dpdk.org, jerin.jacob@caviumnetworks.com, hemant.agrawal@nxp.com,\n\tchaozhu@linux.vnet.ibm.com, yipeng1.wang@intel.com,\n\tdharmik.thakkar@arm.com, gavin.hu@arm.com, honnappa.nagarahalli@arm.com, \n\tnd@arm.com",
        "Date": "Fri,  9 Nov 2018 10:39:13 -0600",
        "Message-Id": "<20181109163917.16845-1-honnappa.nagarahalli@arm.com>",
        "X-Mailer": "git-send-email 2.17.1",
        "Subject": "[dpdk-dev] [PATCH 0/4] hash: separate lf and rw lock lookup code\n\tpaths",
        "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": "The lock-free algorithm has caused significant lookup\nperformance regression for certain use cases. The\nregression is attributed to the use of non-relaxed\nmemory orderings.\n\nTo address the issue, 2 versions of the lookup functions\nare created. One that uses the RW lock and the one that\nis lock-free. This restores the performance regression\ncaused for use cases that used RW lock version of the\nlookup function.\n\nThis series has been split into 4 commits to make the review\nprocess easier. All of these should be squashed into a single\ncommit after the review process is over.\n\nHonnappa Nagarahalli (4):\n  hash: prepare for lock-free and rw-lock separation\n  hash: remove rw-lock calls from lock-free functions\n  hash: remove memory orderings from rw-lock lookup fns\n  hash: separate lf and rw lock lookup code paths\n\n lib/librte_hash/rte_cuckoo_hash.c | 303 ++++++++++++++++++++++++++++--\n 1 file changed, 289 insertions(+), 14 deletions(-)"
}