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GET /api/patches/49638/?format=api
{ "id": 49638, "url": "https://patches.dpdk.org/api/patches/49638/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/20190110210122.24889-1-gage.eads@intel.com/", "project": { "id": 1, "url": "https://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": "<20190110210122.24889-1-gage.eads@intel.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20190110210122.24889-1-gage.eads@intel.com", "date": "2019-01-10T21:01:16", "name": "[0/6] Add non-blocking ring", "commit_ref": null, "pull_url": null, "state": null, "archived": false, "hash": null, "submitter": { "id": 586, "url": "https://patches.dpdk.org/api/people/586/?format=api", "name": "Eads, Gage", "email": "gage.eads@intel.com" }, "delegate": null, "mbox": "https://patches.dpdk.org/project/dpdk/patch/20190110210122.24889-1-gage.eads@intel.com/mbox/", "series": [], "comments": "https://patches.dpdk.org/api/patches/49638/comments/", "check": "pending", "checks": "https://patches.dpdk.org/api/patches/49638/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 [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 8D1351B915;\n\tThu, 10 Jan 2019 22:02:35 +0100 (CET)", "from mga02.intel.com (mga02.intel.com [134.134.136.20])\n\tby dpdk.org (Postfix) with ESMTP id 9DD831B90D\n\tfor <dev@dpdk.org>; Thu, 10 Jan 2019 22:02:33 +0100 (CET)", "from fmsmga003.fm.intel.com ([10.253.24.29])\n\tby orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t10 Jan 2019 13:02:32 -0800", "from txasoft-yocto.an.intel.com (HELO txasoft-yocto.an.intel.com.)\n\t([10.123.72.192])\n\tby FMSMGA003.fm.intel.com with ESMTP; 10 Jan 2019 13:02:31 -0800" ], "X-Amp-Result": "SKIPPED(no attachment in message)", "X-Amp-File-Uploaded": "False", "X-ExtLoop1": "1", "X-IronPort-AV": "E=Sophos;i=\"5.56,462,1539673200\"; d=\"scan'208\";a=\"124971945\"", "From": "Gage Eads <gage.eads@intel.com>", "To": "dev@dpdk.org", "Cc": "olivier.matz@6wind.com, arybchenko@solarflare.com,\n\tbruce.richardson@intel.com, konstantin.ananyev@intel.com", "Date": "Thu, 10 Jan 2019 15:01:16 -0600", "Message-Id": "<20190110210122.24889-1-gage.eads@intel.com>", "X-Mailer": "git-send-email 2.13.6", "Subject": "[dpdk-dev] [PATCH 0/6] Add non-blocking ring", "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": "For some users, the rte ring's \"non-preemptive\" constraint is not acceptable;\nfor example, if the application uses a mixture of pinned high-priority threads\nand multiplexed low-priority threads that share a mempool.\n\nThis patchset introduces a non-blocking ring, on top of which a mempool can run.\nCrucially, the non-blocking algorithm relies on a 128-bit compare-and-swap, so\nit is limited to x86_64 machines.\n\nThe ring uses more compare-and-swap atomic operations than the regular rte ring:\nWith no contention, an enqueue of n pointers uses (1 + 2n) CAS operations and a\ndequeue of n pointers uses 2. This algorithm has worse average-case performance\nthan the regular rte ring (particularly a highly-contended ring with large bulk\naccesses), however:\n- For applications with preemptible pthreads, the regular rte ring's worst-case\n performance (i.e. one thread being preempted in the update_tail() critical\n section) is much worse than the non-blocking ring's.\n- Software caching can mitigate the average case performance for ring-based\n algorithms. For example, a non-blocking ring based mempool (a likely use case\n for this ring) with per-thread caching.\n\nThe non-blocking ring is enabled via a new flag, RING_F_NB. For ease-of-use,\nexisting ring enqueue/dequeue functions work with both \"regular\" and\nnon-blocking rings.\n\nThis patchset also adds non-blocking versions of ring_autotest and\nring_perf_autotest, and a non-blocking ring based mempool.\n\nThis patchset makes ABI changes, and thus an ABI update announcement and\ndeprecation cycle are required.\n\nThis patchset depends on the non-blocking stack patchset[1].\n\n[1] http://mails.dpdk.org/archives/dev/2019-January/122923.html\n\nGage Eads (6):\n ring: change head and tail to pointer-width size\n ring: add a non-blocking implementation\n test_ring: add non-blocking ring autotest\n test_ring_perf: add non-blocking ring perf test\n mempool/ring: add non-blocking ring handlers\n doc: add NB ring comment to EAL \"known issues\"\n\n doc/guides/prog_guide/env_abstraction_layer.rst | 2 +-\n drivers/mempool/ring/rte_mempool_ring.c | 58 ++-\n lib/librte_eventdev/rte_event_ring.h | 6 +-\n lib/librte_ring/rte_ring.c | 53 ++-\n lib/librte_ring/rte_ring.h | 555 ++++++++++++++++++++++--\n lib/librte_ring/rte_ring_generic.h | 16 +-\n lib/librte_ring/rte_ring_version.map | 7 +\n test/test/test_ring.c | 57 ++-\n test/test/test_ring_perf.c | 19 +-\n 9 files changed, 689 insertions(+), 84 deletions(-)", "diff": null, "prefixes": [ "0/6" ] }