From patchwork Tue Jul 18 15:40:20 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiwei Bie X-Patchwork-Id: 27037 Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [IPv6:::1]) by dpdk.org (Postfix) with ESMTP id 6BB7D7CB0; Tue, 18 Jul 2017 17:42:00 +0200 (CEST) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id 2B92147CD for ; Tue, 18 Jul 2017 17:41:47 +0200 (CEST) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Jul 2017 08:41:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.40,378,1496127600"; d="scan'208";a="994343846" Received: from dpdk25.sh.intel.com ([10.67.111.96]) by orsmga003.jf.intel.com with ESMTP; 18 Jul 2017 08:41:45 -0700 From: Tiwei Bie To: dev@dpdk.org, jfreiman@redhat.com Date: Tue, 18 Jul 2017 23:40:20 +0800 Message-Id: <1500392421-76672-6-git-send-email-tiwei.bie@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1500392421-76672-1-git-send-email-tiwei.bie@intel.com> References: <1500392421-76672-1-git-send-email-tiwei.bie@intel.com> Subject: [dpdk-dev] [RFC 5/6] vhost: minor refinement 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" Manually prefetch the first desc in dequeue path. Signed-off-by: Tiwei Bie --- lib/librte_vhost/virtio_net.c | 1 + 1 file changed, 1 insertion(+) diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index 0888d2b..08d53d9 100644 --- a/lib/librte_vhost/virtio_net.c +++ b/lib/librte_vhost/virtio_net.c @@ -1259,6 +1259,7 @@ vhost_dequeue_burst_1_1(struct virtio_net *dev, struct vhost_virtqueue *vq, vq->last_used_idx = desc_idx; if (likely(i)) { + rte_prefetch0(&desc[head_idx & (vq->size - 1)]); for (desc_idx = head_idx + 1; desc_idx != vq->last_used_idx; desc_idx++) {