From mboxrd@z Thu Jan  1 00:00:00 1970
From: linhaifeng <haifeng.lin@huawei.com>
Subject: Re: [PATCH 0/6] vhost: add Tx zero copy support
Date: Sun, 9 Oct 2016 18:46:44 +0800
Message-ID: <57FA2014.1020904@huawei.com>
References: <1471939839-29778-1-git-send-email-yuanhan.liu@linux.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="gbk"
Content-Transfer-Encoding: 8bit
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Yuanhan Liu <yuanhan.liu@linux.intel.com>, <dev@dpdk.org>
Return-path: <dev-bounces@dpdk.org>
Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [58.251.152.64])
 by dpdk.org (Postfix) with ESMTP id 848475A33
 for <dev@dpdk.org>; Sun,  9 Oct 2016 12:53:33 +0200 (CEST)
In-Reply-To: <1471939839-29778-1-git-send-email-yuanhan.liu@linux.intel.com>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

在 2016/8/23 16:10, Yuanhan Liu 写道:
> The basic idea of Tx zero copy is, instead of copying data from the
> desc buf, here we let the mbuf reference the desc buf addr directly.

Is there problem when push vlan to the mbuf which reference the desc buf addr directly?
We know if guest use virtio_net(kernel) maybe skb has no headroom.