From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id AE3C67E75 for ; Fri, 14 Nov 2014 11:38:23 +0100 (CET) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga103.jf.intel.com with ESMTP; 14 Nov 2014 02:45:55 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,385,1413270000"; d="scan'208";a="607771272" Received: from bricha3-mobl3.ger.corp.intel.com ([10.243.20.28]) by orsmga001.jf.intel.com with SMTP; 14 Nov 2014 02:48:21 -0800 Received: by (sSMTP sendmail emulation); Fri, 14 Nov 2014 10:48:21 +0025 Date: Fri, 14 Nov 2014 10:48:21 +0000 From: Bruce Richardson To: "Chi, Xiaobo (NSN - CN/Hangzhou)" Message-ID: <20141114104820.GA13232@bricha3-MOBL3> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Shannon Ltd. User-Agent: Mutt/1.5.23 (2014-03-12) Cc: "dev@dpdk.org" Subject: Re: [dpdk-dev] one lightwight rte_eal_init() for SECONDARY processes which only use sharedmemory X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Nov 2014 10:38:24 -0000 On Wed, Nov 12, 2014 at 03:22:37AM +0000, Chi, Xiaobo (NSN - CN/Hangzhou) wrote: > Hi, > Background: > What we are doing now is port make telecom network element to be cloud based. For one of our product, DPDK is applied not only for fastpath/dataplane processing, but also for Distributed Message eXchange (DMX) between different processes/applications which may located in different VM even different host. for such a DMX system, in one VM, we have one DPDK based dmxdemo (which acts as the PRIMARY) which is in charge of distribute message between different applications, and dozens of applications (act as SECONDARY) to use DPDK based rte_tx_ring/rte_rx_ring/mempool/memzone to send receive messages to dmxdemo. > > Problem: > Here, these DPDK based SECONDARY processes need only the DPDK's hugepage based sharememory mechanism and it's upper libs (such as ring, mempool, etc.), they need not cpu core pinning, iopl privilege changing , pci device, timer, alarm, interrupt, shared_driver_list, core_info, threads for each core, etc. Then, for such kind of SECONDARY processes, the current rte_eal_init() is too heavy. > I have seen some others also met similar troubles. > > Solution: > I write one light weight rte_eal_init(), called rte_eal_secondary_mem_init() as following. It only initializes shared memory and mandatory resources. I expect your review and hope these code can be merged into DPDK main branch. > Rather than writing a whole new API and arg parsing function, might it be better to implement this just as an additional EAL flag that prevents the existing eal_init function from doing all tasks? /Bruce > static void eal_secondary_mem_parse_args(int argc, char **argv) > { > static struct option lgopts[] = { > {OPT_HUGE_DIR, 1, 0, 0}, > {OPT_FILE_PREFIX, 1, 0, 0}, > {0, 0, 0, 0} > }; > > int opt; > int option_index; > > while ((opt = getopt_long(argc, argv, "", lgopts, &option_index)) != EOF) { > > if (!opt ) { > if (!strcmp(lgopts[option_index].name, OPT_HUGE_DIR)) { > internal_config.hugepage_dir = optarg; > } > else if (!strcmp(lgopts[option_index].name, OPT_FILE_PREFIX)) { > internal_config.hugefile_prefix = optarg; > } > } > } > } > > int rte_eal_secondary_mem_init( int argc, char **argv ) > { > static rte_atomic32_t run_once = RTE_ATOMIC32_INIT(0); > const char *logid; > > if (!rte_atomic32_test_and_set(&run_once)) > return -1; > > logid = strrchr(argv[0], '/'); > logid = strdup(logid ? logid + 1: argv[0]); > > if (rte_eal_log_early_init() < 0) > rte_panic("Cannot init early logs\n"); > > memset( &internal_config, 0, sizeof( struct internal_config ) ); > /*this is only for secondary PRBs */ > internal_config.process_type = RTE_PROC_SECONDARY; > internal_config.hugefile_prefix = HUGEFILE_PREFIX_DEFAULT; > internal_config.hugepage_dir = NULL; > /* user can freely define the hugefile_prefix and hugepage_dir */ > eal_secondary_mem_parse_args( argc, argv ); > > RTE_LOG(INFO, EAL, "prefix=%s, dir=%s.\n",internal_config.hugefile_prefix, internal_config.hugepage_dir ); > > /* To share memory config with PRIMARY process */ > internal_config.no_shconf = 0; > rte_config_init(); > > if (rte_eal_memory_init() < 0) > rte_panic("Cannot init memory\n"); > > if (rte_eal_memzone_init() < 0) > rte_panic("Cannot init memzone\n"); > > if (rte_eal_log_init(logid, LOG_DAEMON ) < 0) > rte_panic("Cannot init logs\n"); > > return 0; > } > > brgs, > chi xiaobo > > >