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Wed, 5 Oct 2022 11:20:04 +0200 (CEST) From: =?UTF-8?q?Mattias=20R=C3=B6nnblom?= To: Van@dpdk.org, Haaren@dpdk.org, Harry CC: , Honnappa Nagarahalli , =?UTF-8?q?Morten=20Br=C3=B8rup?= , nd , , =?UTF-8?q?Mattias=20R=C3=B6nnblom?= Subject: [PATCH v2 3/6] service: reduce average case service core overhead Date: Wed, 5 Oct 2022 11:16:12 +0200 Message-ID: <20221005091615.94652-4-mattias.ronnblom@ericsson.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221005091615.94652-1-mattias.ronnblom@ericsson.com> References: <20220906161352.296110-1-mattias.ronnblom@ericsson.com> <20221005091615.94652-1-mattias.ronnblom@ericsson.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM5EUR02FT049:EE_|DB8PR07MB6283:EE_ X-MS-Office365-Filtering-Correlation-Id: de657893-2cc4-43e2-5c78-08daa6b2cb1a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: ericsson.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2022 09:20:06.7613 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: de657893-2cc4-43e2-5c78-08daa6b2cb1a X-MS-Exchange-CrossTenant-Id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=92e84ceb-fbfd-47ab-be52-080c6b87953f; Ip=[192.176.1.74]; Helo=[oa.msg.ericsson.com] X-MS-Exchange-CrossTenant-AuthSource: AM5EUR02FT049.eop-EUR02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR07MB6283 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Optimize service loop so that the starting point is the lowest-indexed service mapped to the lcore in question, and terminate the loop at the highest-indexed service. While the worst case latency remains the same, this patch significantly reduces the service framework overhead for the average case. In particular, scenarios where an lcore only runs a single service, or multiple services which id values are close (e.g., three services with ids 17, 18 and 22), show significant improvements. The worse case is a where the lcore two services mapped to it; one with service id 0 and the other with id 63. On a service lcore serving a single service, the service loop overhead is reduced from ~190 core clock cycles to ~46, on an Intel Cascade Lake generation Xeon. On weakly ordered CPUs, the gain is larger, since the loop included load-acquire atomic operations. Signed-off-by: Mattias Rönnblom --- v2: Added build-time assertion to prevent the maximum number of services to accidentally be changed to a higher value than the implementation supports. (Harry van Haaren) --- lib/eal/common/rte_service.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/lib/eal/common/rte_service.c b/lib/eal/common/rte_service.c index 4d51de638d..035c36b8bb 100644 --- a/lib/eal/common/rte_service.c +++ b/lib/eal/common/rte_service.c @@ -78,6 +78,11 @@ static uint32_t rte_service_library_initialized; int32_t rte_service_init(void) { + /* Hard limit due to the use of an uint64_t-based bitmask (and the + * clzl intrinsic). + */ + RTE_BUILD_BUG_ON(RTE_SERVICE_NUM_MAX > 64); + if (rte_service_library_initialized) { RTE_LOG(NOTICE, EAL, "service library init() called, init flag %d\n", @@ -472,7 +477,6 @@ static int32_t service_runner_func(void *arg) { RTE_SET_USED(arg); - uint32_t i; const int lcore = rte_lcore_id(); struct core_state *cs = &lcore_states[lcore]; @@ -486,10 +490,17 @@ service_runner_func(void *arg) RUNSTATE_RUNNING) { const uint64_t service_mask = cs->service_mask; + uint8_t start_id; + uint8_t end_id; + uint8_t i; - for (i = 0; i < RTE_SERVICE_NUM_MAX; i++) { - if (!service_registered(i)) - continue; + if (service_mask == 0) + continue; + + start_id = __builtin_ctzl(service_mask); + end_id = 64 - __builtin_clzl(service_mask); + + for (i = start_id; i < end_id; i++) { /* return value ignored as no change to code flow */ service_run(i, cs, service_mask, service_get(i), 1); } -- 2.34.1