From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 1D18F4281E; Fri, 24 Mar 2023 04:18:10 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id DECD042D63; Fri, 24 Mar 2023 04:17:04 +0100 (CET) Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by mails.dpdk.org (Postfix) with ESMTP id ECE2942D51 for <dev@dpdk.org>; Fri, 24 Mar 2023 04:17:02 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679627823; x=1711163823; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=i+emlEp3ifo13uyg8O/EbDX5JIJB9ZkepIFS1heXcIs=; b=C679JML9zRsZGl012Wj0fPVPfkwL4GZ4V+lA3C6Rh/cQEU/hDUxiv3eb JxX18jIv8lYjOMcAnPVwujFmtjLxQc1kfr8rXh9pftlW5nprE7pt2JGqs 0GP51YwZG9vhxzaMiqYg9IhPZwTqLNWrW60iyQbhXZtg+v1aKGnN42PNu V8jjVLI3UEBVsuypY1DcXioHlW6A3TQ9VaLM2C7MMgq1q8P2ZCGw66qAX TLQB/tkaCPdQvzWg4FnxtXvhFtKjskhm7Yyd5JAtM7BnZyN89uzE4C5gY fprJ4fX+8klGDxlFxGf40qEpEy8EdL3lHSlAyzb0M3tAdXtJ/xaZaro1h g==; X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="402266500" X-IronPort-AV: E=Sophos;i="5.98,286,1673942400"; d="scan'208";a="402266500" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Mar 2023 20:17:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10658"; a="684998599" X-IronPort-AV: E=Sophos;i="5.98,286,1673942400"; d="scan'208";a="684998599" Received: from dpdk-zhirun-lmm.sh.intel.com ([10.67.119.68]) by fmsmga007.fm.intel.com with ESMTP; 23 Mar 2023 20:17:00 -0700 From: Zhirun Yan <zhirun.yan@intel.com> To: dev@dpdk.org, jerinj@marvell.com, kirankumark@marvell.com, ndabilpuram@marvell.com Cc: cunming.liang@intel.com, haiyue.wang@intel.com, Zhirun Yan <zhirun.yan@intel.com> Subject: [PATCH v2 15/15] doc: update multicore dispatch model in graph guides Date: Fri, 24 Mar 2023 11:16:22 +0900 Message-Id: <20230324021622.1369006-16-zhirun.yan@intel.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230324021622.1369006-1-zhirun.yan@intel.com> References: <20221117050926.136974-1-zhirun.yan@intel.com> <20230324021622.1369006-1-zhirun.yan@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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>, <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>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Update graph documentation to introduce new multicore dispatch model. Signed-off-by: Haiyue Wang <haiyue.wang@intel.com> Signed-off-by: Cunming Liang <cunming.liang@intel.com> Signed-off-by: Zhirun Yan <zhirun.yan@intel.com> --- doc/guides/prog_guide/graph_lib.rst | 59 +++++++++++++++++++++++++++-- 1 file changed, 55 insertions(+), 4 deletions(-) diff --git a/doc/guides/prog_guide/graph_lib.rst b/doc/guides/prog_guide/graph_lib.rst index 1cfdc86433..e3c0d652e4 100644 --- a/doc/guides/prog_guide/graph_lib.rst +++ b/doc/guides/prog_guide/graph_lib.rst @@ -189,14 +189,65 @@ In the above example, A graph object will be created with ethdev Rx node of port 0 and queue 0, all ipv4* nodes in the system, and ethdev tx node of all ports. -Multicore graph processing -~~~~~~~~~~~~~~~~~~~~~~~~~~ -In the current graph library implementation, specifically, -``rte_graph_walk()`` and ``rte_node_enqueue*`` fast path API functions +graph model chossing +~~~~~~~~~~~~~~~~~~~~ +Currently, there are 2 different walking model. Use +``rte_graph_worker_model_set()`` to set the walk model. + +RTC (Run-To-Completion) +^^^^^^^^^^^^^^^^^^^^^^^ +This is the default graph walking model. specifically, +``rte_graph_walk_rtc()`` and ``rte_node_enqueue*`` fast path API functions are designed to work on single-core to have better performance. The fast path API works on graph object, So the multi-core graph processing strategy would be to create graph object PER WORKER. +Example: + +Graph: node-0 -> node-1 -> node-2 @Core0. + +.. code-block:: diff + + + - - - - - - - - - - - - - - - - - - - - - + + ' Core #0 ' + ' ' + ' +--------+ +---------+ +--------+ ' + ' | Node-0 | --> | Node-1 | --> | Node-2 | ' + ' +--------+ +---------+ +--------+ ' + ' ' + + - - - - - - - - - - - - - - - - - - - - - + + +Dispatch model +^^^^^^^^^^^^^^ +The dispatch model enables a cross-core dispatching mechanism which employs +a scheduling work-queue to dispatch streams to other worker cores which +being associated with the destination node. + +Use ``rte_graph_model_dispatch_lcore_affinity_set()`` to set lcore affinity +with the node. +Each worker core will have a graph repetition. Use ``rte_graph_clone()`` to +clone graph for each worker and use``rte_graph_model_dispatch_core_bind()`` +to bind graph with the worker core. + +Example: + +Graph topo: node-0 -> Core1; node-1 -> node-2; node-2 -> node-3. +Config graph: node-0 @Core0; node-1/3 @Core1; node-2 @Core2. + +.. code-block:: diff + + + - - - - - -+ +- - - - - - - - - - - - - + + - - - - - -+ + ' Core #0 ' ' Core #1 ' ' Core #2 ' + ' ' ' ' ' ' + ' +--------+ ' ' +--------+ +--------+ ' ' +--------+ ' + ' | Node-0 | - - - ->| Node-1 | | Node-3 |<- - - - | Node-2 | ' + ' +--------+ ' ' +--------+ +--------+ ' ' +--------+ ' + ' ' ' | ' ' ^ ' + + - - - - - -+ +- - -|- - - - - - - - - - + + - - -|- - -+ + | | + + - - - - - - - - - - - - - - - - + + + In fast path ~~~~~~~~~~~~ Typical fast-path code looks like below, where the application -- 2.37.2