From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: Re: [PATCH v4] vhost: batch used descs chains write-back
 with packed ring
Date: Fri, 21 Dec 2018 10:20:53 +0100
Message-ID: <9f30e6f1-d373-fac1-4662-cbeecec3b75f@redhat.com>
References: <20181220164755.8509-1-maxime.coquelin@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
To: dev@dpdk.org, i.maximets@samsung.com, tiwei.bie@intel.com,
 zhihong.wang@intel.com, jfreiman@redhat.com, mst@redhat.com
Return-path: <dev-bounces@dpdk.org>
Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28])
 by dpdk.org (Postfix) with ESMTP id 914361BD76
 for <dev@dpdk.org>; Fri, 21 Dec 2018 10:21:01 +0100 (CET)
In-Reply-To: <20181220164755.8509-1-maxime.coquelin@redhat.com>
Content-Language: en-US
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>



On 12/20/18 5:47 PM, Maxime Coquelin wrote:
> Instead of writing back descriptors chains in order, let's
> write the first chain flags last in order to improve batching.
> 
> Also, move the write barrier in logging cache sync, so that it
> is done only when logging is enabled. It means there is now
> one more barrier for split ring when logging is enabled.
> 
> With Kernel's pktgen benchmark, ~3% performance gain is measured.
> 
> Signed-off-by: Maxime Coquelin<maxime.coquelin@redhat.com>
> ---
>   lib/librte_vhost/vhost.h      |  2 ++
>   lib/librte_vhost/virtio_net.c | 19 ++++++++++++++++---
>   2 files changed, 18 insertions(+), 3 deletions(-)

Applied to dpdk-next-virtio

Maxime