From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f52.google.com (mail-oi0-f52.google.com [209.85.218.52]) by dpdk.org (Postfix) with ESMTP id F3B7BC5E2 for ; Fri, 24 Jun 2016 16:50:15 +0200 (CEST) Received: by mail-oi0-f52.google.com with SMTP id u201so118200853oie.0 for ; Fri, 24 Jun 2016 07:50:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to; bh=PIaAGnbxUvOaBR2D4VMJ3EjduZT7XEy8TfYHNC0gqbs=; b=OSXqlLCG6MWIUC9ch8Msc8RnNDajPVzk3cT30GYLBjlX6Ogj+rfUzTPurLkSU3lvNt 14WGhIB552fz/jeSZep3S/VoGR9AjCVzOMct+OWi571y9UD7l6MVwPm8SXM5f2bOcJll 3FRHsS80U40BTomu4Pa0jfcmgklYClwfUQgGMxsSyuRtk8csPNIQhVrDnGI0uav5lsGo Y+5sU9Dr1S+zm2FdgaFMZbJKeIrAWW/sFPCvkcqO++V4q7YhPjSl4bNFdhJUVc5cqVu7 3fSZffefXuB7Jco/MHexh0dAjTNVQrlB2nU4ay5PlES4Y5w+vDK2Wo2lW7ynQji442Sl 0YDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=PIaAGnbxUvOaBR2D4VMJ3EjduZT7XEy8TfYHNC0gqbs=; b=Kit1acYTzYqxjw42dLWXFfGjvGATWytYMMIednixny+B08uz3LCvoE4DzryhdEoC+8 +Gcvkk81wMtCG4A32prdFIJSUcUEoPJWQV6g7fDgbRXFfjC8SFYbj9KJV4WxY7AqQEf2 xyyHsGn+mbz8O3rm/s5xAGOWH1MdlOw2lIh2uD0JUcjzwYUgHsv1AmXeVWxNDuCTup0z piPPx0OtT26fViFlCoDTMIvw9OW8lePZGau46HfsSrZagUsLwsBZhG/YngT/JDRZDt8Y /bqX5/BeVZKdoHa+0rnVJIf8FfYxYjMHOsTa8AiEtXPVkkLvb57fS7e51ST55kjDgGPt UXnA== X-Gm-Message-State: ALyK8tLgt9pXZMVGbSIRwsjOAm1lLCVpHtuwOc2lDYpuLrl9ajMc5nz43RGpmkYmDvg8q9vNXDRVBx1K9cnaJg== X-Received: by 10.157.7.40 with SMTP id 37mr2926547ote.145.1466779815332; Fri, 24 Jun 2016 07:50:15 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.0.6 with HTTP; Fri, 24 Jun 2016 07:49:55 -0700 (PDT) From: Asim Jamshed Date: Fri, 24 Jun 2016 23:49:55 +0900 Message-ID: To: users@dpdk.org Content-Type: text/plain; charset=UTF-8 Subject: [dpdk-users] dpdk ixgbe PMD lro limits X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Jun 2016 14:50:16 -0000 Hi, Apologies in advance if this question has been asked in the past. I have been performing mTCP-related tests on dpdk-16.04 with ixgbe PMD. I am using 82599ES 10-Gigabit adapters for my experiments. I have a few queries regarding LRO. 1) What is the theoretical maximum size of the Ethernet frame I can get from the driver once LRO is enabled? In my experiments, I was seeing packet size as high as 16KB. Can it be as high as ~2^16 bytes (iph->tot_len)? 2) Since the NIC is reassembling payloads (of one flow) into a single packet, what does the Ethernet controller do with the tcp checksum field in the TCP header? I am observing that each LRO packet has checksum value as zero? Is that normal? I could not find any relevant documentation on the Web. Thanks in advance, --Asim