From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marko Kovacevic Subject: [PATCH v3] doc: update definition of lcore id and lcore index Date: Fri, 2 Feb 2018 15:02:32 +0000 Message-ID: <20180202150232.6611-1-marko.kovacevic@intel.com> References: <20180201165347.15646-1-marko.kovacevic@intel.com> Cc: john.mcnamara@intel.com, vipin.varghese@intel.com, bruce.richardson@intel.com, stable@dpdk.org, Marko Kovacevic To: dev@dpdk.org Return-path: In-Reply-To: <20180201165347.15646-1-marko.kovacevic@intel.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Added examples in lcore index for better explanation on various examples, Sited examples for lcore id. Signed-off-by: Marko Kovacevic --- V3: - Rephrased examples for lcore index and id - Bruce V2: - Added clearer description to lcore id - Bruce - Reframed examples for lcore index - Bruce --- lib/librte_eal/common/include/rte_lcore.h | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/lib/librte_eal/common/include/rte_lcore.h b/lib/librte_eal/common/include/rte_lcore.h index d84bcff..0472220 100644 --- a/lib/librte_eal/common/include/rte_lcore.h +++ b/lib/librte_eal/common/include/rte_lcore.h @@ -57,7 +57,14 @@ RTE_DECLARE_PER_LCORE(unsigned, _lcore_id); /**< Per thread "lcore id". */ RTE_DECLARE_PER_LCORE(rte_cpuset_t, _cpuset); /**< Per thread "cpuset". */ /** - * Return the ID of the execution unit we are running on. + * Return the Application thread ID of the execution unit. + * + * Note: in most cases the lcore id returned here will also correspond + * to the processor id of the CPU on which the thread is pinned, this + * will not be the case if the user has explicitly changed the thread to + * core affinities using --lcores EAL argument e.g. --lcores '(0-3)@10' + * to run threads with lcore IDs 0, 1, 2 and 3 on physical core 10.. + * * @return * Logical core ID (in EAL thread) or LCORE_ID_ANY (in non-EAL thread) */ @@ -94,7 +101,12 @@ rte_lcore_count(void) /** * Return the index of the lcore starting from zero. - * The order is physical or given by command line (-l option). + * + * When option -c or -l is given, the index corresponds + * to the order in the list. + * For example: + * -c 0x30, lcore 4 has index 0, and 5 has index 1. + * -l 22,18 lcore 22 has index 0, and 18 has index 1. * * @param lcore_id * The targeted lcore, or -1 for the current one. -- 2.9.5