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{ "id": 71968, "url": "http://patches.dpdk.org/api/covers/71968/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/cover/20200622132531.21857-1-david.marchand@redhat.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": "<20200622132531.21857-1-david.marchand@redhat.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20200622132531.21857-1-david.marchand@redhat.com", "date": "2020-06-22T13:25:22", "name": "[v3,0/9] Register non-EAL threads as lcore", "submitter": { "id": 1173, "url": "http://patches.dpdk.org/api/people/1173/?format=api", "name": "David Marchand", "email": "david.marchand@redhat.com" }, "mbox": "http://patches.dpdk.org/project/dpdk/cover/20200622132531.21857-1-david.marchand@redhat.com/mbox/", "series": [ { "id": 10551, "url": "http://patches.dpdk.org/api/series/10551/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=10551", "date": "2020-06-22T13:25:22", "name": "Register non-EAL threads as lcore", "version": 3, "mbox": "http://patches.dpdk.org/series/10551/mbox/" } ], "comments": "http://patches.dpdk.org/api/covers/71968/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 BBCF5A0519;\n\tMon, 22 Jun 2020 15:25:58 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id E125F1D6CA;\n\tMon, 22 Jun 2020 15:25:57 +0200 (CEST)", "from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com\n [205.139.110.120]) by dpdk.org (Postfix) with ESMTP id 6205A1D6A2\n for <dev@dpdk.org>; Mon, 22 Jun 2020 15:25:56 +0200 (CEST)", "from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com\n [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id\n us-mta-144-nr4UevP8NdaPDrfNCGQfjA-1; Mon, 22 Jun 2020 09:25:50 -0400", "from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com\n [10.5.11.11])\n (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))\n (No client certificate requested)\n by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CA844835B46;\n Mon, 22 Jun 2020 13:25:48 +0000 (UTC)", "from dmarchan.remote.csb (unknown [10.40.193.229])\n by smtp.corp.redhat.com (Postfix) with ESMTP id 9A8367167C;\n Mon, 22 Jun 2020 13:25:45 +0000 (UTC)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1592832355;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding:\n in-reply-to:in-reply-to:references:references;\n bh=uQ9EJPjJx77667iZDhsdFUm7p4n8V6c/7GxZn2hnQUI=;\n b=NyymNjPoiIr3xQA2FCxcIA3r//PWk9GnibgP2SGWv3EjEs4xTr8C3bPIULKHRCw6yIxc+s\n PmQquYEpyP41z61n0/6nwFz00Iz3MthPZKw981NZ8d+q8dfP7wNoFuWxhWqiStalezpaCm\n atWkN2TkA1czgI4h7Z1FqCL5/wcFgIU=", "X-MC-Unique": "nr4UevP8NdaPDrfNCGQfjA-1", "From": "David Marchand <david.marchand@redhat.com>", "To": "dev@dpdk.org", "Cc": "jerinjacobk@gmail.com, bruce.richardson@intel.com, mdr@ashroe.eu,\n ktraynor@redhat.com, ian.stokes@intel.com, i.maximets@ovn.org", "Date": "Mon, 22 Jun 2020 15:25:22 +0200", "Message-Id": "<20200622132531.21857-1-david.marchand@redhat.com>", "In-Reply-To": "<20200610144506.30505-1-david.marchand@redhat.com>", "References": "<20200610144506.30505-1-david.marchand@redhat.com>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 2.79 on 10.5.11.11", "X-Mimecast-Spam-Score": "0", "X-Mimecast-Originator": "redhat.com", "Content-Type": "text/plain; charset=US-ASCII", "Content-Transfer-Encoding": "8bit", "Subject": "[dpdk-dev] [PATCH v3 0/9] Register non-EAL threads as lcore", "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": "OVS and some other applications have been hacking into DPDK internals to\nfake EAL threads and avoid performance penalty of only having non-EAL\nthreads.\n\nThis series proposes to add a new type of lcores and maps those threads\nto such lcores.\nnon-EAL threads won't run the DPDK eal mainloop.\nAs a consequence, part of the EAL threads API cannot work.\n\nHaving new lcores appearing during the process lifetime is not expected\nby some DPDK components. This is addressed by introducing init/uninit\ncallacks invoked when hotplugging of such lcore.\n\nThere is still some work/discussion:\n- refuse new lcore role in incompatible EAL threads API (or document it\n only as those API were already incompatible?),\n- think about deprecation notices for existing RTE_FOREACH_LCORE macros\n and consorts, it is probably worth discussing on how to iterate over\n lcores,\n\nFor the interested parties, I have a patch [1] against dpdk-latest OVS\nbranch that makes use of this series.\n\n1: https://github.com/david-marchand/ovs/commit/dpdk-latest-external-lcores\n\nChanges since v2:\n- fixed windows build error due to missing trace stub,\n- fixed bug when rolling back on lcore register,\n\nChanges since v1:\n- rebased on master (conflicts on merged Windows series),\n- separated lcore role code cleanup in a patch,\n- tried to use a single naming, so kept non-EAL threads as the main\n notion. non-EAL threads are then distinguished between registered and\n unregistered non-EAL threads,\n- added unit tests (still missing some coverage, marked with a FIXME),\n- reworked callbacks call under a common rwlock lock which protects\n lcores allocations and callbacks registration,\n- introduced lcore iterators and converted the bucket mempool driver," }