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GET /api/patches/66372/?format=api
{ "id": 66372, "url": "https://patches.dpdk.org/api/patches/66372/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/20200309065106.23800-3-mattias.ronnblom@ericsson.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": "<20200309065106.23800-3-mattias.ronnblom@ericsson.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20200309065106.23800-3-mattias.ronnblom@ericsson.com", "date": "2020-03-09T06:51:00", "name": "[2/8] event/dsw: reduce max flows to speed up load balancing", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": true, "hash": "c9c3fa4755f823442c8328fd5f414cc4fa8f540e", "submitter": { "id": 1077, "url": "https://patches.dpdk.org/api/people/1077/?format=api", "name": "Mattias Rönnblom", "email": "mattias.ronnblom@ericsson.com" }, "delegate": { "id": 310, "url": "https://patches.dpdk.org/api/users/310/?format=api", "username": "jerin", "first_name": "Jerin", "last_name": "Jacob", "email": "jerinj@marvell.com" }, "mbox": "https://patches.dpdk.org/project/dpdk/patch/20200309065106.23800-3-mattias.ronnblom@ericsson.com/mbox/", "series": [ { "id": 8828, "url": "https://patches.dpdk.org/api/series/8828/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/list/?series=8828", "date": "2020-03-09T06:51:04", "name": "DSW performance and statistics improvements", "version": 1, "mbox": "https://patches.dpdk.org/series/8828/mbox/" } ], "comments": "https://patches.dpdk.org/api/patches/66372/comments/", "check": "fail", "checks": "https://patches.dpdk.org/api/patches/66372/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 79BA5A052E;\n\tMon, 9 Mar 2020 07:52:20 +0100 (CET)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 83CA41C01B;\n\tMon, 9 Mar 2020 07:51:54 +0100 (CET)", "from EUR02-VE1-obe.outbound.protection.outlook.com\n (mail-eopbgr20050.outbound.protection.outlook.com [40.107.2.50])\n by dpdk.org (Postfix) with ESMTP id D37201BFF2\n for <dev@dpdk.org>; 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arm.com; dkim=none (message not signed)\n header.d=none;arm.com; dmarc=pass action=none header.from=ericsson.com;", "Received-SPF": "Pass (protection.outlook.com: domain of ericsson.com designates\n 192.176.1.74 as permitted sender)\n receiver=protection.outlook.com;\n client-ip=192.176.1.74; 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 07:51:00 +0100", "Message-ID": "<20200309065106.23800-3-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; 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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": "VI1PR07MB4333", "Subject": "[dpdk-dev] [PATCH 2/8] event/dsw: reduce max flows to speed up load\n\tbalancing", "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": "Reduce the maximum number of DSW flows from 32k to 8k, to be able\nrebalance load faster.\n\nSigned-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>\n---\n drivers/event/dsw/dsw_evdev.h | 16 ++++++++++++++--\n 1 file changed, 14 insertions(+), 2 deletions(-)", "diff": "diff --git a/drivers/event/dsw/dsw_evdev.h b/drivers/event/dsw/dsw_evdev.h\nindex 5c7b6108d..dc44bce81 100644\n--- a/drivers/event/dsw/dsw_evdev.h\n+++ b/drivers/event/dsw/dsw_evdev.h\n@@ -19,8 +19,20 @@\n \n #define DSW_MAX_EVENTS (16384)\n \n-/* Code changes are required to allow more flows than 32k. */\n-#define DSW_MAX_FLOWS_BITS (15)\n+/* Multiple 24-bit flow ids will map to the same DSW-level flow. The\n+ * number of DSW flows should be high enough make it unlikely that\n+ * flow ids of several large flows hash to the same DSW-level flow.\n+ * Such collisions will limit parallism and thus the number of cores\n+ * that may be utilized. However, configuring a large number of DSW\n+ * flows might potentially, depending on traffic and actual\n+ * application flow id value range, result in each such DSW-level flow\n+ * being very small. The effect of migrating such flows will be small,\n+ * in terms amount of processing load redistributed. This will in turn\n+ * reduce the load balancing speed, since flow migration rate has an\n+ * upper limit. Code changes are required to allow > 32k DSW-level\n+ * flows.\n+ */\n+#define DSW_MAX_FLOWS_BITS (13)\n #define DSW_MAX_FLOWS (1<<(DSW_MAX_FLOWS_BITS))\n #define DSW_MAX_FLOWS_MASK (DSW_MAX_FLOWS-1)\n \n", "prefixes": [ "2/8" ] }