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{
    "id": 85600,
    "url": "http://patchwork.dpdk.org/api/covers/85600/?format=api",
    "web_url": "http://patchwork.dpdk.org/project/dpdk/cover/20201221142321.51606-1-joyce.kong@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",
        "list_archive_url": "https://inbox.dpdk.org/dev",
        "list_archive_url_format": "https://inbox.dpdk.org/dev/{}",
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    },
    "msgid": "<20201221142321.51606-1-joyce.kong@arm.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/20201221142321.51606-1-joyce.kong@arm.com",
    "date": "2020-12-21T14:23:17",
    "name": "[v1,0/4] replace smp barriers in virtio with C11 atomic",
    "submitter": {
        "id": 970,
        "url": "http://patchwork.dpdk.org/api/people/970/?format=api",
        "name": "Joyce Kong",
        "email": "joyce.kong@arm.com"
    },
    "mbox": "http://patchwork.dpdk.org/project/dpdk/cover/20201221142321.51606-1-joyce.kong@arm.com/mbox/",
    "series": [
        {
            "id": 14407,
            "url": "http://patchwork.dpdk.org/api/series/14407/?format=api",
            "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=14407",
            "date": "2020-12-21T14:23:17",
            "name": "replace smp barriers in virtio with C11 atomic",
            "version": 1,
            "mbox": "http://patchwork.dpdk.org/series/14407/mbox/"
        }
    ],
    "comments": "http://patchwork.dpdk.org/api/covers/85600/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 ABA3CA09EF;\n\tMon, 21 Dec 2020 15:23:51 +0100 (CET)",
            "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id A723CCACF;\n\tMon, 21 Dec 2020 15:23:49 +0100 (CET)",
            "from foss.arm.com (foss.arm.com [217.140.110.172])\n by dpdk.org (Postfix) with ESMTP id 850DCCAA9\n for <dev@dpdk.org>; Mon, 21 Dec 2020 15:23:47 +0100 (CET)",
            "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 C8B981FB;\n Mon, 21 Dec 2020 06:23:45 -0800 (PST)",
            "from net-arm-thunderx2-03.shanghai.arm.com\n (net-arm-thunderx2-03.shanghai.arm.com [10.169.208.206])\n by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 9A1233F6CF;\n Mon, 21 Dec 2020 06:23:43 -0800 (PST)"
        ],
        "From": "Joyce Kong <joyce.kong@arm.com>",
        "To": "maxime.coquelin@redhat.com, chenbo.xia@intel.com,\n honnappa.nagarahalli@arm.com, ruifeng.wang@arm.com",
        "Cc": "dev@dpdk.org,\n\tnd@arm.com",
        "Date": "Mon, 21 Dec 2020 22:23:17 +0800",
        "Message-Id": "<20201221142321.51606-1-joyce.kong@arm.com>",
        "X-Mailer": "git-send-email 2.29.2",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit",
        "Subject": "[dpdk-dev] [PATCH v1 0/4] replace smp barriers in virtio with C11\n\tatomic",
        "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": "This patchset is to replace rte smp barriers in virtio with C11 atomic\nbuilt-ins.\n\nThe rte_smp_*mb APIs provide full barrier functionality. However, many\nuse cases do not require full barriers. To support such use cases, DPDK\nwill adopt C11 barrier semantics and provide wrappers using C11 atomic\nbuilt-ins.[1]\n\nWith this patch set, under 0.001% acceptable loss with 2 cores on vhost\nside and 1 core on virtio side, PVP case(vhost-user + virtio-user) has\n6.7% perf uplift for the split in_order path on ThunderX2 platform.\n\n[1] http://code.dpdk.org/dpdk/latest/source/doc/guides/rel_notes/deprecation.rst\n\nJoyce Kong (4):\n  net/virtio: remove unnecessary rmb barrier\n  net/virtio: replace smp barrier with IO barrier\n  net/virtio: replace full barrier with relaxed barrier for Arm platform\n  net/virtio: replace full barrier with thread fence\n\n drivers/net/virtio/virtio_ethdev.c | 10 ++++-----\n drivers/net/virtio/virtqueue.h     | 35 +++++++++++++++---------------\n 2 files changed, 22 insertions(+), 23 deletions(-)"
}