From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sender-pp-092.zoho.com (sender-pp-092.zoho.com [135.84.80.237]) by dpdk.org (Postfix) with ESMTP id 9C0E42C2F for ; Thu, 1 Nov 2018 07:42:39 +0100 (CET) ARC-Seal: i=1; a=rsa-sha256; t=1541054557; cv=none; d=zoho.com; s=zohoarc; b=lGO35tYB+NpGX5L95DTQbHgKSfhopjtyhN5xMzGNh4Z5PxTKg0vrzd+6TjRAKTiZHjNV+nluusG+z2rfGogYwZOudDdSjrzd+htdkhyGEUHu3gVm32RrwqzmoEefeCoO1Pe553s1TCG/OJL7ZBWPQe0DsOJG5MEhFv9dDQsAj+s= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1541054557; h=Content-Type:Content-Transfer-Encoding:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To:ARC-Authentication-Results; bh=nv4ABQSH+Jd7ifDVxnf+AfPSCE2b/zteUqM+4EPfYg8=; b=MX5zE63WahPH06djW/pBNZ8FydOTizYi+K8Ddrj6ha1zwXEaQqPqtoodI4KV7Q86vE7+ssnURSD9VdS9SgqjzOZnmWpdFENQV9NgDe8JeFqj6lSe0rmnx/utJj99uw7GmAZxiaJB9YLFteuCDp8kWlDmSuBrjan8/A47CdclJL4= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=pass header.i=zoho.com; spf=pass smtp.mailfrom=irsaber@zoho.com; dmarc=pass header.from= header.from= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=zapps768; d=zoho.com; h=to:references:subject:from:message-id:date:user-agent:mime-version:in-reply-to:content-type; b=j6BF4kU9ilR0RhbH0DkYC7g0oM4ddXtF/Ysdmxmpf0RjlDO+D56mv/eqdM1ijxH4Icf7brX43xft LmSjvljn2KZ4bKRhhvTcD8hLkMJn1UdJ2/W4/1mLc3djPjq7hAwe DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1541054557; s=default; d=zoho.com; i=irsaber@zoho.com; h=To:References:Subject:From:Message-ID:Date:MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding; l=912; bh=nv4ABQSH+Jd7ifDVxnf+AfPSCE2b/zteUqM+4EPfYg8=; b=d8CX31ReLjR3dbcBsX5ytWm8agMyeXUCbGVkr3alHfOKN7IfvLkQmPhI4BuQhUs2 5tkoBnS+UFJgE58MQnbOG+PWY7/XViI/HqIcRsq+kJt/nSNWZxwfuaOQbPoCIa1i6rO wFthBzP49f9m0QenpufwlJReH0dgKqEYWVBkm2xo= Received: from [192.168.1.8] (188.210.133.189 [188.210.133.189]) by mx.zohomail.com with SMTPS id 1541054555683419.51118319787474; Wed, 31 Oct 2018 23:42:35 -0700 (PDT) To: dev@dpdk.org References: <561D2498.1060707@intel.com> From: Saber Rezvani Message-ID: Date: Thu, 1 Nov 2018 10:12:32 +0330 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <561D2498.1060707@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-ZohoMailClient: External Subject: Re: [dpdk-dev] IXGBE RX packet loss with 5+ cores X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Nov 2018 06:42:40 -0000 According to the problem to this thread --> http://mails.dpdk.org/archives/dev/2015-October/024966.html =C2=A0Venkatesan, Venky mentioned the following reason: To add a little more detail - this ends up being both a bandwidth and a transaction bottleneck. Not only do you add an increased transaction count, you also add a huge amount of bandwidth overhead (each 16 byte descriptor is preceded by a PCI-E TLP which is about the same size). So what ends up happening in the case where the incoming packets are bifurcated to different queues (1 per queue) is that you have 2x the number of transactions (1 for the packet and one for the descriptor) and then we essentially double the bandwidth used because you now have the TLP overhead per descriptor write. But I couldn't figure out why we have bandwidth and transaction bottleneck. Can anyone help me? Best regards, Saber