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{
    "id": 105407,
    "url": "http://patches.dpdk.org/api/covers/105407/?format=api",
    "web_url": "http://patches.dpdk.org/project/dpdk/cover/20211224225923.806498-1-dharmik.thakkar@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": "<20211224225923.806498-1-dharmik.thakkar@arm.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/20211224225923.806498-1-dharmik.thakkar@arm.com",
    "date": "2021-12-24T22:59:22",
    "name": "[0/1] mempool: implement index-based per core cache",
    "submitter": {
        "id": 1108,
        "url": "http://patches.dpdk.org/api/people/1108/?format=api",
        "name": "Dharmik Thakkar",
        "email": "dharmik.thakkar@arm.com"
    },
    "mbox": "http://patches.dpdk.org/project/dpdk/cover/20211224225923.806498-1-dharmik.thakkar@arm.com/mbox/",
    "series": [
        {
            "id": 21027,
            "url": "http://patches.dpdk.org/api/series/21027/?format=api",
            "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=21027",
            "date": "2021-12-24T22:59:23",
            "name": "mempool: implement index-based per core cache",
            "version": 1,
            "mbox": "http://patches.dpdk.org/series/21027/mbox/"
        }
    ],
    "comments": "http://patches.dpdk.org/api/covers/105407/comments/",
    "headers": {
        "Return-Path": "<dev-bounces@dpdk.org>",
        "X-Original-To": "patchwork@inbox.dpdk.org",
        "Delivered-To": "patchwork@inbox.dpdk.org",
        "Received": [
            "from mails.dpdk.org (mails.dpdk.org [217.70.189.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id AE877A0352;\n\tSat, 25 Dec 2021 00:00:20 +0100 (CET)",
            "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 1B169410FA;\n\tSat, 25 Dec 2021 00:00:14 +0100 (CET)",
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        ],
        "From": "Dharmik Thakkar <dharmik.thakkar@arm.com>",
        "To": "",
        "Cc": "dev@dpdk.org, nd@arm.com, honnappa.nagarahalli@arm.com,\n ruifeng.wang@arm.com, Dharmik Thakkar <dharmik.thakkar@arm.com>",
        "Subject": "[PATCH 0/1] mempool: implement index-based per core cache",
        "Date": "Fri, 24 Dec 2021 16:59:22 -0600",
        "Message-Id": "<20211224225923.806498-1-dharmik.thakkar@arm.com>",
        "X-Mailer": "git-send-email 2.25.1",
        "In-Reply-To": "<20210930172735.2675627-1-dharmik.thakkar@arm.com>",
        "References": "<20210930172735.2675627-1-dharmik.thakkar@arm.com>",
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        "X-BeenThere": "dev@dpdk.org",
        "X-Mailman-Version": "2.1.29",
        "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/>",
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        "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"
    },
    "content": "Current mempool per core cache implementation stores pointers to mbufs\nOn 64b architectures, each pointer consumes 8B\nThis patch replaces it with index-based implementation,\nwhere in each buffer is addressed by (pool base address + index)\nIt reduces the amount of memory/cache required for per core cache\n\nL3Fwd performance testing reveals minor improvements in the cache\nperformance (L1 and L2 misses reduced by 0.60%)\nwith no change in throughput\n\nMicro-benchmarking the patch using mempool_perf_test shows\nsignificant improvement with majority of the test cases\n\nNumber of cores = 1:\nn_get_bulk=1 n_put_bulk=1 n_keep=32 %_change_with_patch=18.01\nn_get_bulk=1 n_put_bulk=1 n_keep=128 %_change_with_patch=19.91\nn_get_bulk=1 n_put_bulk=4 n_keep=32 %_change_with_patch=-20.37 (regression)\nn_get_bulk=1 n_put_bulk=4 n_keep=128 %_change_with_patch=-17.01 (regression) \nn_get_bulk=1 n_put_bulk=32 n_keep=32 %_change_with_patch=-25.06 (regression)\nn_get_bulk=1 n_put_bulk=32 n_keep=128 %_change_with_patch=-23.81 (regression)\nn_get_bulk=4 n_put_bulk=1 n_keep=32 %_change_with_patch=53.93\nn_get_bulk=4 n_put_bulk=1 n_keep=128 %_change_with_patch=60.90\nn_get_bulk=4 n_put_bulk=4 n_keep=32 %_change_with_patch=1.64\nn_get_bulk=4 n_put_bulk=4 n_keep=128 %_change_with_patch=8.76\nn_get_bulk=4 n_put_bulk=32 n_keep=32 %_change_with_patch=-4.71 (regression)\nn_get_bulk=4 n_put_bulk=32 n_keep=128 %_change_with_patch=-3.19 (regression)\nn_get_bulk=32 n_put_bulk=1 n_keep=32 %_change_with_patch=65.63\nn_get_bulk=32 n_put_bulk=1 n_keep=128 %_change_with_patch=75.19\nn_get_bulk=32 n_put_bulk=4 n_keep=32 %_change_with_patch=11.75\nn_get_bulk=32 n_put_bulk=4 n_keep=128 %_change_with_patch=15.52\nn_get_bulk=32 n_put_bulk=32 n_keep=32 %_change_with_patch=13.45\nn_get_bulk=32 n_put_bulk=32 n_keep=128 %_change_with_patch=11.58\n\nNumber of core = 2:\nn_get_bulk=1 n_put_bulk=1 n_keep=32 %_change_with_patch=18.21\nn_get_bulk=1 n_put_bulk=1 n_keep=128 %_change_with_patch=21.89\nn_get_bulk=1 n_put_bulk=4 n_keep=32 %_change_with_patch=-21.21 (regression)\nn_get_bulk=1 n_put_bulk=4 n_keep=128 %_change_with_patch=-17.05 (regression)\nn_get_bulk=1 n_put_bulk=32 n_keep=32 %_change_with_patch=-26.09 (regression)\nn_get_bulk=1 n_put_bulk=32 n_keep=128 %_change_with_patch=-23.49 (regression)\nn_get_bulk=4 n_put_bulk=1 n_keep=32 %_change_with_patch=56.28\nn_get_bulk=4 n_put_bulk=1 n_keep=128 %_change_with_patch=67.69\nn_get_bulk=4 n_put_bulk=4 n_keep=32 %_change_with_patch=1.45\nn_get_bulk=4 n_put_bulk=4 n_keep=128 %_change_with_patch=8.84\nn_get_bulk=4 n_put_bulk=32 n_keep=32 %_change_with_patch=-5.27 (regression)\nn_get_bulk=4 n_put_bulk=32 n_keep=128 %_change_with_patch=-3.09 (regression)\nn_get_bulk=32 n_put_bulk=1 n_keep=32 %_change_with_patch=76.11\nn_get_bulk=32 n_put_bulk=1 n_keep=128 %_change_with_patch=86.06\nn_get_bulk=32 n_put_bulk=4 n_keep=32 %_change_with_patch=11.86\nn_get_bulk=32 n_put_bulk=4 n_keep=128 %_change_with_patch=16.55\nn_get_bulk=32 n_put_bulk=32 n_keep=32 %_change_with_patch=13.01\nn_get_bulk=32 n_put_bulk=32 n_keep=128 %_change_with_patch=11.51\n\n\nFrom analyzing the results, it is clear that for n_get_bulk and\nn_put_bulk sizes of 32 there is no performance regression\nIMO, the other sizes are not practical from performance perspective\nand the regression in those cases can be safely ignored\n\nDharmik Thakkar (1):\n  mempool: implement index-based per core cache\n\n lib/mempool/rte_mempool.h             | 114 +++++++++++++++++++++++++-\n lib/mempool/rte_mempool_ops_default.c |   7 ++\n 2 files changed, 119 insertions(+), 2 deletions(-)"
}