From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 08DBAA0487 for ; Sun, 30 Jun 2019 18:22:00 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 469251B974; Sun, 30 Jun 2019 18:21:47 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by dpdk.org (Postfix) with ESMTP id 369E21B952 for ; Sun, 30 Jun 2019 18:21:44 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B88F213A1; Sun, 30 Jun 2019 09:21:43 -0700 (PDT) Received: from net-arm-thunderx2.shanghai.arm.com (net-arm-thunderx2.shanghai.arm.com [10.169.40.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CB9DC3F718; Sun, 30 Jun 2019 09:21:41 -0700 (PDT) From: Gavin Hu To: dev@dpdk.org Cc: thomas@monjalon.net, jerinj@marvell.com, hemant.agrawal@nxp.com, bruce.richardson@intel.com, chaozhu@linux.vnet.ibm.com, Honnappa.Nagarahalli@arm.com, nd@arm.com, gavin.hu@arm.com Date: Mon, 1 Jul 2019 00:21:13 +0800 Message-Id: <1561911676-37718-3-git-send-email-gavin.hu@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1561911676-37718-1-git-send-email-gavin.hu@arm.com> References: <1561911676-37718-1-git-send-email-gavin.hu@arm.com> Subject: [dpdk-dev] [RFC 2/5] ticketlock: use new API to reduce contention on aarch64 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" While using ticket lock, cores repeatedly poll the lock variable. This is replaced by rte_wait_until_equal API. Running ticketlock_autotest on ThunderX2, with different numbers of cores and depths of rings, 3%~8% performance gains were measured. Signed-off-by: Gavin Hu Reviewed-by: Honnappa Nagarahalli --- lib/librte_eal/common/include/generic/rte_ticketlock.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/librte_eal/common/include/generic/rte_ticketlock.h b/lib/librte_eal/common/include/generic/rte_ticketlock.h index 191146f..6820f01 100644 --- a/lib/librte_eal/common/include/generic/rte_ticketlock.h +++ b/lib/librte_eal/common/include/generic/rte_ticketlock.h @@ -64,8 +64,8 @@ static inline __rte_experimental void rte_ticketlock_lock(rte_ticketlock_t *tl) { uint16_t me = __atomic_fetch_add(&tl->s.next, 1, __ATOMIC_RELAXED); - while (__atomic_load_n(&tl->s.current, __ATOMIC_ACQUIRE) != me) - rte_pause(); + if (__atomic_load_n(&tl->s.current, __ATOMIC_ACQUIRE) != me) + rte_wait_until_equal_acquire(&tl->s.current, me); } /** -- 2.7.4