From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <eomereadig@gmail.com>
Received: from mail-oi0-f48.google.com (mail-oi0-f48.google.com
 [209.85.218.48]) by dpdk.org (Postfix) with ESMTP id 43E953784
 for <dev@dpdk.org>; Fri,  4 Sep 2015 16:03:32 +0200 (CEST)
Received: by oiww128 with SMTP id w128so12331130oiw.2
 for <dev@dpdk.org>; Fri, 04 Sep 2015 07:03:29 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:in-reply-to:references:date:message-id:subject:from:to
 :cc:content-type;
 bh=PMdW7nCk5DBAYZRCHOAOz/+MdVDljiRpXh8m65j+q4A=;
 b=VqqG3awIF7sOUA2dgTYbpOrA7V0gZOIWPw74ti8bNBxJeCJEWJvnwkolk2LHz7III/
 9TRvEBuKuyOm+dAQTY6HXJQHcbUKu97jpO5/zAZ97HnGmdi2AzVXV3NmeqwgNfFq51TG
 1jyP2rf0ORWGcIcPD2cJcn0H+WnZsx6R/4LK3EXFLXwYXjjevqqty4cy6AGZE8Z/IRm1
 ubxI3ONMzEQzNvx8bUqWOYT6gBo3L6FHn03uwsJ8t4youZHpFuHx5FtBLEsRBawfprHv
 gZcPhRSY5XsFdJ3El6Yfpl06fNWJ0ZXOTYeYmDtrQIyOG2Giy+IACdjXBcLTvMIj1kEH
 AxhQ==
MIME-Version: 1.0
X-Received: by 10.202.192.138 with SMTP id q132mr3244024oif.118.1441375407985; 
 Fri, 04 Sep 2015 07:03:27 -0700 (PDT)
Received: by 10.76.45.74 with HTTP; Fri, 4 Sep 2015 07:03:27 -0700 (PDT)
In-Reply-To: <55E91AB2.4080604@sts.kz>
References: <55E91AB2.4080604@sts.kz>
Date: Fri, 4 Sep 2015 10:03:27 -0400
Message-ID: <CAMFWN9n4hfTgBLpZKdU5j=q_wE4nkXdjY-cT3MeBnXMPhTLTeA@mail.gmail.com>
From: Kyle Larose <eomereadig@gmail.com>
To: Yerden Zhumabekov <e_zhumabekov@sts.kz>
Content-Type: text/plain; charset=UTF-8
X-Content-Filtered-By: Mailman/MimeDel 2.1.15
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] pcap->eth low TX performance
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
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>
X-List-Received-Date: Fri, 04 Sep 2015 14:03:33 -0000

Are you reading from the pcap faster than the device can transmit? Does the
app hold off reading from the pcap when the ethdev is pushing back, or does
it just tail drop?

On Fri, Sep 4, 2015 at 12:14 AM, Yerden Zhumabekov <e_zhumabekov@sts.kz>
wrote:

> Hello,
>
> Did anyone try to work with pcap PMD recently? We're testing our app
> with this setup:
>
> PCAP --- rte_eth_rx_burst--> APP-> rte_eth_tx_burst -> ethdev
>
> I'm experiencing very low TX performance leading to massive mbuf drop
> while trying to send those packets over the Ethernet device. I tried
> running ordinary l2fwd and got the same issue with over 80-90% of
> packets drop. When I substitute PCAP with another ordinary Ethernet
> device, everything works fine. Can anyone share an idea?
>
> --
> Sincerely,
>
> Yerden Zhumabekov
> State Technical Service
> Astana, KZ
>
>