From patchwork Wed Dec 19 08:21:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Coquelin X-Patchwork-Id: 49111 X-Patchwork-Delegate: maxime.coquelin@redhat.com 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 942A31BC82; Wed, 19 Dec 2018 09:21:45 +0100 (CET) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id AD30B1BC05; Wed, 19 Dec 2018 09:21:43 +0100 (CET) Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 12AF65F722; Wed, 19 Dec 2018 08:21:43 +0000 (UTC) Received: from localhost.localdomain (ovpn-112-26.ams2.redhat.com [10.36.112.26]) by smtp.corp.redhat.com (Postfix) with ESMTP id A587960DB7; Wed, 19 Dec 2018 08:21:33 +0000 (UTC) From: Maxime Coquelin To: dev@dpdk.org, i.maximets@samsung.com, tiwei.bie@intel.com, zhihong.wang@intel.com, jasowang@redhat.com, mst@redhat.com Cc: stable@dpdk.org, Maxime Coquelin Date: Wed, 19 Dec 2018 09:21:13 +0100 Message-Id: <20181219082113.24455-5-maxime.coquelin@redhat.com> In-Reply-To: <20181219082113.24455-1-maxime.coquelin@redhat.com> References: <20181219082113.24455-1-maxime.coquelin@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 19 Dec 2018 08:21:43 +0000 (UTC) Subject: [dpdk-dev] [PATCH v2 4/4] vhost: remove useless prefetch for packed ring descriptor 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" This prefetch does not show any performance improvement. Signed-off-by: Maxime Coquelin --- lib/librte_vhost/virtio_net.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index a9be633de..4d201a3fd 100644 --- a/lib/librte_vhost/virtio_net.c +++ b/lib/librte_vhost/virtio_net.c @@ -1437,8 +1437,6 @@ virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq, { uint16_t i; - rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]); - if (unlikely(dev->dequeue_zero_copy)) { struct zcopy_mbuf *zmbuf, *next;