From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <maverickjin88@gmail.com>
Received: from mail-it0-f54.google.com (mail-it0-f54.google.com
 [209.85.214.54]) by dpdk.org (Postfix) with ESMTP id 0EBE8231E
 for <users@dpdk.org>; Thu, 30 Aug 2018 01:56:53 +0200 (CEST)
Received: by mail-it0-f54.google.com with SMTP id p79-v6so267609itp.3
 for <users@dpdk.org>; Wed, 29 Aug 2018 16:56:52 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025;
 h=mime-version:from:date:message-id:subject:to;
 bh=0ggRzgKgZA6esc3t8KFcjVO5Mc6O9M6CBflF2ykejn4=;
 b=jjZn+v+r0TzivB2ZBxVVnUMqalgfQ982LBScLWINHpDv8OfXTd8WLYESUnwZxgJ4vt
 s+6CeSwjOBNoAdgL/N0+Uufin5kMOTb6sv2ZjY16gP4zErCdKnQRYldxEKe1QteAiDMT
 ZKMm2y/HZUnY0Njl7aI9z2Wtcb1lhmNCaoo6Y/qk1ItPwO52c2ixqumrkohyX2+IOpad
 U64gRpLHLVIQY247KDAalB9uxpuoVZHRQLMkaBL6AYEGCo1PRn5p8arM1KAs+9bX1cGf
 6mNcjCHe8RkfLPRR3yP5y00GVlNNFKNipTrA5uzLrF9eYUb/05wp8UCRMg/3e//v4SWp
 XIZg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20161025;
 h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
 bh=0ggRzgKgZA6esc3t8KFcjVO5Mc6O9M6CBflF2ykejn4=;
 b=dIfFiX/rUHjtRSLwIGPX8f/aDMJFqPn48jIs3xHKG5NiKhDhelhfuagAgQTC8FS43z
 J+UbIMmrCxUN3tq2Ss2A5+XTUpAduHSz6slz9f7wTFmo0627YaU+iavyYc6iyMpI/bUu
 oYW4/7wUuMZXmowSfz4Ao5I/n/W0Co0KgUdjc5wwR5h0sv2wtrYD7lWtwtB3/joK/7FV
 NejcwTs07WTKo3u0kV0eV/tmA0F6GbMGmN/h8NonszeyOG1qsbtA7SgVpew1Tz0/rFwl
 4I635eccqUGriQgp6aihi74W/LqxEyf3YjnX9LzbiH2Pv9jTeBLWmGICVC7Q2YdNGozM
 sApQ==
X-Gm-Message-State: APzg51CtcKiEPqKLDDjh04f6yg+h/Gi/9oxCLH60ZeH+hxrLGiLxSGMn
 bZyTdCRvhLPBwAcLftMmUd8Nw323b+F51H5b+cOX4f9m
X-Google-Smtp-Source: ANB0VdbzIXhT7L35TNT2gMP/dGadyTpep5LGomp9xJsnwemr68MdzvxHbzF3XrSjwVqU7qJYsnPUY817H7rphhZNdxo=
X-Received: by 2002:a24:c48a:: with SMTP id
 v132-v6mr266437itf.72.1535587012019; 
 Wed, 29 Aug 2018 16:56:52 -0700 (PDT)
MIME-Version: 1.0
Received: by 2002:a02:2e54:0:0:0:0:0 with HTTP; Wed, 29 Aug 2018 16:56:51
 -0700 (PDT)
From: Sungho Hong <maverickjin88@gmail.com>
Date: Wed, 29 Aug 2018 16:56:51 -0700
Message-ID: <CAK8vx=iM3LzEhM6bzKRomYHE3VydAT0WvT63tk-NDpFJJHn5HA@mail.gmail.com>
To: users@dpdk.org
Content-Type: text/plain; charset="UTF-8"
X-Content-Filtered-By: Mailman/MimeDel 2.1.15
Subject: [dpdk-users] Proper way of notifying the application that DPDK
 received messages
X-BeenThere: users@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DPDK usage discussions <users.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/users>,
 <mailto:users-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/users/>
List-Post: <mailto:users@dpdk.org>
List-Help: <mailto:users-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/users>,
 <mailto:users-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Wed, 29 Aug 2018 23:56:53 -0000

Hello

currently, I'am using dpdk by sending and receiving the packets in to the
rte-rings. I'am having difficulty of finding the proper way of to notify
the application that the DPDK received incoming messages.

In order to check the whether the rte_ring has received the data or not, I
run a busy loop on the rte_ring.
here is the example below

while (1) {
  if (rte_ring_dequeue(rx_ring, &_msg) < 0) {
    usleep(5);
  } else {
    recv_msg = (char *) _msg;
    if (chara_debug) printf("[%d] Server merge
data::[%.24s...]__length::[%ld]\n", batched_packets, recv_msg,
strlen(recv_msg));
    collect_packets++;
    if (collect_packets > MERGE_PACKETS) break;
  }
}

However, my fellow developers say that this is not a efficient way nor the
proper way of checking received messages. Busy polling should be only done
in the DPDK API and not in the application.

Is there a way for DPDK to send a signal to the application so that the
application can only check the rte_ring only when there is a received
message?.