From patchwork Mon Apr 8 03:02:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Phil Yang X-Patchwork-Id: 52379 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 4CCBD4CE4; Mon, 8 Apr 2019 05:01:17 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by dpdk.org (Postfix) with ESMTP id 18CD44C8F for ; Mon, 8 Apr 2019 05:01:12 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8442216A3; Sun, 7 Apr 2019 20:01:11 -0700 (PDT) Received: from phil-VirtualBox.shanghai.arm.com (unknown [10.169.108.140]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 088373F718; Sun, 7 Apr 2019 20:01:09 -0700 (PDT) From: Phil Yang To: dev@dpdk.org, thomas@monjalon.net Cc: david.hunt@intel.com, reshma.pattan@intel.com, gavin.hu@arm.com, honnappa.nagarahalli@arm.com, phil.yang@arm.com, nd@arm.com Date: Mon, 8 Apr 2019 11:02:30 +0800 Message-Id: <1554692551-28275-3-git-send-email-phil.yang@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1554692551-28275-1-git-send-email-phil.yang@arm.com> References: <1554692551-28275-1-git-send-email-phil.yang@arm.com> In-Reply-To: <1546508946-12552-1-git-send-email-phil.yang@arm.com> References: <1546508946-12552-1-git-send-email-phil.yang@arm.com> Subject: [dpdk-dev] [PATCH v4 2/3] test/distributor: replace sync builtins with atomic builtins 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" '__sync' built-in functions are deprecated, should use the '__atomic' built-in instead. the sync built-in functions are full barriers, while atomic built-in functions offer less restrictive one-way barriers, which help performance. Here is the example test result on TX2: sudo ./arm64-armv8a-linuxapp-gcc/app/test -l 112-139 \ -n 4 --socket-mem=1024,1024 -- -i RTE>>distributor_perf_autotest *** distributor_perf_autotest without this patch *** ==== Cache line switch test === Time for 33554432 iterations = 1519202730 ticks Ticks per iteration = 45 *** distributor_perf_autotest with this patch *** ==== Cache line switch test === Time for 33554432 iterations = 1251715496 ticks Ticks per iteration = 37 Less ticks needed for the cache line switch test. It got 17% of performance improvement. Signed-off-by: Phil Yang Reviewed-by: Gavin Hu Reviewed-by: Ruifeng Wang Reviewed-by: Joyce Kong Reviewed-by: Dharmik Thakkar Reviewed-by: Honnappa Nagarahalli --- app/test/test_distributor.c | 7 ++++--- app/test/test_distributor_perf.c | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/app/test/test_distributor.c b/app/test/test_distributor.c index 98919ec..0364637 100644 --- a/app/test/test_distributor.c +++ b/app/test/test_distributor.c @@ -62,7 +62,7 @@ handle_work(void *arg) struct worker_params *wp = arg; struct rte_distributor *db = wp->dist; unsigned int count = 0, num = 0; - unsigned int id = __sync_fetch_and_add(&worker_idx, 1); + unsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED); int i; for (i = 0; i < 8; i++) @@ -270,7 +270,7 @@ handle_work_with_free_mbufs(void *arg) unsigned int count = 0; unsigned int i; unsigned int num = 0; - unsigned int id = __sync_fetch_and_add(&worker_idx, 1); + unsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED); for (i = 0; i < 8; i++) buf[i] = NULL; @@ -343,7 +343,8 @@ handle_work_for_shutdown_test(void *arg) unsigned int total = 0; unsigned int i; unsigned int returned = 0; - const unsigned int id = __sync_fetch_and_add(&worker_idx, 1); + const unsigned int id = __atomic_fetch_add(&worker_idx, 1, + __ATOMIC_RELAXED); num = rte_distributor_get_pkt(d, id, buf, buf, num); diff --git a/app/test/test_distributor_perf.c b/app/test/test_distributor_perf.c index edf1998..89b28f0 100644 --- a/app/test/test_distributor_perf.c +++ b/app/test/test_distributor_perf.c @@ -111,7 +111,7 @@ handle_work(void *arg) unsigned int count = 0; unsigned int num = 0; int i; - unsigned int id = __sync_fetch_and_add(&worker_idx, 1); + unsigned int id = __atomic_fetch_add(&worker_idx, 1, __ATOMIC_RELAXED); struct rte_mbuf *buf[8] __rte_cache_aligned; for (i = 0; i < 8; i++)