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GET /api/patches/66374/?format=api
{ "id": 66374, "url": "http://patches.dpdk.org/api/patches/66374/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/patch/20200309065106.23800-2-mattias.ronnblom@ericsson.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": "<20200309065106.23800-2-mattias.ronnblom@ericsson.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20200309065106.23800-2-mattias.ronnblom@ericsson.com", "date": "2020-03-09T06:50:59", "name": "[1/8] event/dsw: reduce latency in low-load situations", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "3b084da25f8ea07e0adcffb759151068781ec854", "submitter": { "id": 1077, "url": "http://patches.dpdk.org/api/people/1077/?format=api", "name": "Mattias Rönnblom", "email": "mattias.ronnblom@ericsson.com" }, "delegate": { "id": 310, "url": "http://patches.dpdk.org/api/users/310/?format=api", "username": "jerin", "first_name": "Jerin", "last_name": "Jacob", "email": "jerinj@marvell.com" }, "mbox": "http://patches.dpdk.org/project/dpdk/patch/20200309065106.23800-2-mattias.ronnblom@ericsson.com/mbox/", "series": [ { "id": 8828, "url": "http://patches.dpdk.org/api/series/8828/?format=api", "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=8828", "date": "2020-03-09T06:51:04", "name": "DSW performance and statistics improvements", "version": 1, "mbox": "http://patches.dpdk.org/series/8828/mbox/" } ], "comments": "http://patches.dpdk.org/api/patches/66374/comments/", "check": "fail", "checks": "http://patches.dpdk.org/api/patches/66374/checks/", "tags": {}, "related": [], "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 13286A052E;\n\tMon, 9 Mar 2020 07:52:43 +0100 (CET)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 766491C030;\n\tMon, 9 Mar 2020 07:51:57 +0100 (CET)", "from EUR04-VI1-obe.outbound.protection.outlook.com\n (mail-eopbgr80043.outbound.protection.outlook.com [40.107.8.43])\n by dpdk.org (Postfix) with ESMTP id 87AC41BFF9\n for <dev@dpdk.org>; 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helo=oa.msg.ericsson.com;", "From": "=?utf-8?q?Mattias_R=C3=B6nnblom?= <mattias.ronnblom@ericsson.com>", "To": "<jerinj@marvell.com>", "CC": "<dev@dpdk.org>, <stefan.sundkvist@ericsson.com>, <Ola.Liljedahl@arm.com>,\n\t=?utf-8?q?Mattias_R=C3=B6nnblom?= <mattias.ronnblom@ericsson.com>", "Date": "Mon, 9 Mar 2020 07:50:59 +0100", "Message-ID": "<20200309065106.23800-2-mattias.ronnblom@ericsson.com>", "X-Mailer": "git-send-email 2.17.1", "In-Reply-To": "<20200309065106.23800-1-mattias.ronnblom@ericsson.com>", "References": "<20200309065106.23800-1-mattias.ronnblom@ericsson.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"UTF-8\"", "Content-Transfer-Encoding": "8bit", "X-EOPAttributedMessage": "0", "X-Forefront-Antispam-Report": "CIP:192.176.1.74; IPV:; CTRY:SE; EFV:NLI;\n SFV:NSPM;\n SFS:(10009020)(4636009)(346002)(39860400002)(376002)(396003)(136003)(199004)(189003)(107886003)(6916009)(54906003)(316002)(36756003)(478600001)(4326008)(70206006)(70586007)(356004)(2906002)(6666004)(2616005)(956004)(336012)(8676002)(246002)(5660300002)(86362001)(8936002)(26005)(186003)(1076003)(7636002)(21314003);\n DIR:OUT; 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Ip=[192.176.1.74];\n Helo=[oa.msg.ericsson.com]", "X-MS-Exchange-CrossTenant-FromEntityHeader": "HybridOnPrem", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "AM0PR07MB4450", "Subject": "[dpdk-dev] [PATCH 1/8] event/dsw: reduce latency in low-load\n\tsituations", "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": "In DSW, in case a port can't produce any events for the application to\nconsume, the port is considered idle.\n\nTo slightly reduce wall-time latency, flush the port's output buffer\nin case of such an empty dequeue.\n\nSigned-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>\n---\n drivers/event/dsw/dsw_event.c | 10 +++++-----\n 1 file changed, 5 insertions(+), 5 deletions(-)", "diff": "diff --git a/drivers/event/dsw/dsw_event.c b/drivers/event/dsw/dsw_event.c\nindex 296adea18..7f1f29218 100644\n--- a/drivers/event/dsw/dsw_event.c\n+++ b/drivers/event/dsw/dsw_event.c\n@@ -1245,11 +1245,11 @@ dsw_event_dequeue_burst(void *port, struct rte_event *events, uint16_t num,\n \t\t * seem to improve performance.\n \t\t */\n \t\tdsw_port_record_seen_events(port, events, dequeued);\n-\t}\n-\t/* XXX: Assuming the port can't produce any more work,\n-\t *\tconsider flushing the output buffer, on dequeued ==\n-\t *\t0.\n-\t */\n+\t} else /* Zero-size dequeue means a likely idle port, and thus\n+\t\t* we can afford trading some efficiency for a slightly\n+\t\t* reduced event wall-time latency.\n+\t\t*/\n+\t\tdsw_port_flush_out_buffers(dsw, port);\n \n #ifdef DSW_SORT_DEQUEUED\n \tdsw_stable_sort(events, dequeued, sizeof(events[0]), dsw_cmp_event);\n", "prefixes": [ "1/8" ] }