From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <jfreimann@redhat.com>
Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28])
 by dpdk.org (Postfix) with ESMTP id 892CD1B44B
 for <dev@dpdk.org>; Wed, 28 Nov 2018 11:05:41 +0100 (CET)
Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com
 [10.5.11.15])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by mx1.redhat.com (Postfix) with ESMTPS id 872433091791;
 Wed, 28 Nov 2018 10:05:40 +0000 (UTC)
Received: from localhost (dhcp-192-209.str.redhat.com [10.33.192.209])
 by smtp.corp.redhat.com (Postfix) with ESMTPS id 0B9DD5D787;
 Wed, 28 Nov 2018 10:05:35 +0000 (UTC)
Date: Wed, 28 Nov 2018 11:05:34 +0100
From: Jens Freimann <jfreimann@redhat.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, tiwei.bie@intel.com, zhihong.wang@intel.com
Message-ID: <20181128100534.6oil7r2zj6popznl@jenstp.localdomain>
References: <20181128094700.14598-1-maxime.coquelin@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Disposition: inline
In-Reply-To: <20181128094700.14598-1-maxime.coquelin@redhat.com>
User-Agent: NeoMutt/20180716
X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16
 (mx1.redhat.com [10.5.110.41]); Wed, 28 Nov 2018 10:05:40 +0000 (UTC)
Subject: Re: [dpdk-dev] [PATCH] vhost: batch used descriptors chains
 write-back with packed ring
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
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>
X-List-Received-Date: Wed, 28 Nov 2018 10:05:41 -0000

On Wed, Nov 28, 2018 at 10:47:00AM +0100, Maxime Coquelin wrote:
>Instead of writing back descriptors chains in order, let's
>write the first chain flags last in order to improve batching.
>
>With Kernel's pktgen benchmark, ~3% performance gain is measured.
>
>Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>---
> lib/librte_vhost/virtio_net.c | 37 ++++++++++++++++++++++-------------
> 1 file changed, 23 insertions(+), 14 deletions(-)
>

Tested-by: Jens Freimann <jfreimann@redhat.com>
Reviewed-by: Jens Freimann <jfreimann@redhat.com>