From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f50.google.com (mail-wm0-f50.google.com [74.125.82.50]) by dpdk.org (Postfix) with ESMTP id F00747CF6 for ; Mon, 4 Sep 2017 17:53:03 +0200 (CEST) Received: by mail-wm0-f50.google.com with SMTP id u26so5690968wma.0 for ; Mon, 04 Sep 2017 08:53:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=TFUNsX2b9lXTskIVBMVG05upUa+Psh79J2ykn2I2iPo=; b=PwvCf3ncl4ZUyxHvPMZBcEoXJgAYANNW1faGTryudUeqdKmy1wFGNKZmQmDBN9/olw pBGF3wozCzUa+bcisAbKtZM5ENFYbXkbaq7jFjZsE1daRcI2f+V7aE6Cei4qqeEAGIJt AzJRIDk8D/LIfjPFz3OyXQclr/eMEsiLw/RsUVeHXYAgefpShtLuIUt+sBFQPI6mvzQP TN/HOEi7+2ohTKhuTM4cND2WiCnlxZpTBVSO28GW4LrETbC3hOCW6GrDobQ3eU0e62U2 gnwVRzYhKE5zC4GPDku/vJFsjDRnDq+EKA1dlH2Ao3uZUb5/tqdK4KLn+Z2egLXBZtuC kK7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=TFUNsX2b9lXTskIVBMVG05upUa+Psh79J2ykn2I2iPo=; b=tQa8ylpB/dSZfU3oCqKtbCwkudvxume1zZz8cYhb/MIqJtkptfgDt8iOVs2k1l8NRs 3KSXTuMPVEfu0GztmW9BkIDZN2ueKvK6aJeiCZjPauPoC81LgUnfJyyGvv/TP70V98z0 pZmcNDbNDRmte6mGauVXOhzZ8xx+flfe6BiqOKV32bA5MxVR5/Sn6jFwmdA4NvTyR1Zp ie6jwPSBYZ8C+leMyF8KSFR+JZIrtnrVHienYfQ7vUVRfYuo66QNMbENUQ2m8CJ22hIO alW/WEd2L5XdFk7hDKDrU6Gx2aLZUT+cNJ2UKeXQE1GtmCq/ouN4l465rvIF/jfzPVnO xroA== X-Gm-Message-State: AHPjjUiTHcgf9ls0UKCYjwWAH29ZrbDaYJR9roy9eX6dstarFSfwbhLP 5yMbRTzw3V1jLmST X-Google-Smtp-Source: ADKCNb4hqnfxJCphsDeNnNiOJjBiac6stzN8RACsw271Bf8NhKOLcrNjCdK12YJr2EO8T5d3BH6WLw== X-Received: by 10.28.30.73 with SMTP id e70mr942164wme.5.1504540383749; Mon, 04 Sep 2017 08:53:03 -0700 (PDT) Received: from 6wind.com (host.78.145.23.62.rev.coltfrance.com. [62.23.145.78]) by smtp.gmail.com with ESMTPSA id b72sm7318149wmd.0.2017.09.04.08.53.02 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 04 Sep 2017 08:53:02 -0700 (PDT) Date: Mon, 4 Sep 2017 17:52:52 +0200 From: Adrien Mazarguil To: Arjun Roy Cc: Shahaf Shuler , Nelio Laranjeiro , "users@dpdk.org" Message-ID: <20170904155252.GZ4301@6wind.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [dpdk-users] Mellanox ConnectX-4, DPDK and extreme latency issues X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Sep 2017 15:53:04 -0000 Arjun, On Thu, Jun 29, 2017 at 05:26:02AM +0000, Shahaf Shuler wrote: > Hi Arjun, > > Thursday, June 22, 2017 9:40 PM, Arjun Roy, > > > > Greetings all. > > > > I have a weird issue regarding excessive latency using Mellanox ConnectX-4 > > 100Gbe cards, DPDK and packet forwarding. Specifically: running the l3fwd > > and basicfwd DPDK example programs yields ping latencies of several (5-8) > > milliseconds. I tried the same test using an Intel X-540 AT2 card on the same > > systems and the latency was on the order of 4-5 microseconds. > > Thanks for reporting. > This is the first time we hit such scenario, we will check it internally and will get back to you with answers. Back to this topic, could it be the same issue as reported by Sagi, "mlx5 high latency observed on send operations" [1]? The related patches have been submitted and are on track for DPDK 17.11. While they are not yet on the master tree, you can find them on dpdk-next-net. [1] http://dpdk.org/ml/archives/dev/2017-August/073081.html -- Adrien Mazarguil 6WIND