From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f48.google.com (mail-oi0-f48.google.com [209.85.218.48]) by dpdk.org (Postfix) with ESMTP id B3D87532D for ; Tue, 28 Jun 2016 08:41:23 +0200 (CEST) Received: by mail-oi0-f48.google.com with SMTP id u201so9959488oie.0 for ; Mon, 27 Jun 2016 23:41:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=PIaAGnbxUvOaBR2D4VMJ3EjduZT7XEy8TfYHNC0gqbs=; b=QvVxFad4R4hGUdu+7iMjIJwLKYkZIE//zo7doQAIBoc1Ne9JMi/nFDZizRiK5fYD22 n3byyIJsObkndYM8MzXcl3f+l946dHdNl00en2jfHMBdxqDoSwvY/pBQkO3Eqk3DG4jL 8RTeLTnd+o2Ez2CiVLOw+70Pn1g9USuHx2qJd51V+rWlFFfo4T3YcDZT673B6rBw0FLy PTYF+CQJg6IluKIIMLN1pNvS6Qk3bK2f07ZCMRdEaaOz9Za8aUrkXcGtL52l2hf7kg21 A4UBbwPBROsZR88kCfJDA9pE9YGsf2Oyld5GdLIi2+CyLnWf6/cebmshudvAkgAhTuOI B5Dg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=PIaAGnbxUvOaBR2D4VMJ3EjduZT7XEy8TfYHNC0gqbs=; b=WdyhDah8JRYHuifMKOXxhQjOuuWPZVxRF0gFYLMB+8vzeydoHvRektDSwnxuc5teWi CJszWQbYUU9C2vNpffMkbekTwT7vFtua2wqL+oXGF3Rruie2uMIdZBwr8C6NXfXaDe66 TW9Yx4Cbb5paKMhTw3UwplAwpZswtpLdHsNA9TcbkPpuNjO5e/fdoLmvbCR+I2yPcoPP g9cqt8fldZAkLzKxY4GgPinNvleKnnGk/aDyXHRyx9PRJ2lPj2HUkP1TinjtrmYP2mE/ yojGke273byKiEYiMuF3PmpVlFyh9BbDck3lcWSHUrDIYmIaKMGQwQXfcG+/hxOBNVWC YE5g== X-Gm-Message-State: ALyK8tIqFCZ8vBZNPYkcy8MKDAPxzwqzFXkPtwhhgjNW/Vgyy63wND3mToVWw2and5RSIF3JkeyQ3g0eLv8TOw== X-Received: by 10.157.2.200 with SMTP id 66mr750167otl.188.1467096083160; Mon, 27 Jun 2016 23:41:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.157.0.6 with HTTP; Mon, 27 Jun 2016 23:41:03 -0700 (PDT) In-Reply-To: References: From: Asim Jamshed Date: Tue, 28 Jun 2016 15:41:03 +0900 Message-ID: To: dev@dpdk.org Content-Type: text/plain; charset=UTF-8 Subject: [dpdk-dev] Fwd: dpdk ixgbe PMD lro limits X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Jun 2016 06:41:24 -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