From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tiwei Bie Subject: [RFC 5/6] vhost: minor refinement Date: Tue, 18 Jul 2017 23:40:20 +0800 Message-ID: <1500392421-76672-6-git-send-email-tiwei.bie@intel.com> References: <1500392421-76672-1-git-send-email-tiwei.bie@intel.com> To: dev@dpdk.org, jfreiman@redhat.com Return-path: 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) In-Reply-To: <1500392421-76672-1-git-send-email-tiwei.bie@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" 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++) { -- 2.7.4