From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 62DB7A0613 for ; Thu, 29 Aug 2019 16:40:15 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id F082A1DEFC; Thu, 29 Aug 2019 16:40:14 +0200 (CEST) Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) by dpdk.org (Postfix) with ESMTP id 7C3E01D505 for ; Thu, 29 Aug 2019 16:40:13 +0200 (CEST) Received: by mail-pl1-f174.google.com with SMTP id 4so1667107pld.10 for ; Thu, 29 Aug 2019 07:40:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FeCBkJ+dnxrTr5B4rhrT+mjglFV/iExuuPaWOe64i1U=; b=XLR97Q+yKpIP3zjwiLquSCs6KvEetN8ScwQmXNO0FL4tQAueUohMaNzs79z+RKATP3 1bC8OAWEKmbWIJUZuBVAt1fKCBRP3ru97STres5devwbaqF7b6Fa2yYbXPfAEqvirx3E PF1ZP2lyw5R2TWLeZ8U5whJUVENxW0Hk00KpGhcAe5vhU346SlmqFFPN5bU1a0ZxlBbw HS0qn+HfgVlezMwvII08737y+rMXLnGdDmmcr4xyp/mWx5JCf4K0tZLuo0jD6x+cjt2t uiDaaOOXZH5kdkxZ3DU2tVfBciHuh3m2OGdKXS0mtcgzfziz4Ypg6Eii85UBH3atk3wt JnSg== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=FeCBkJ+dnxrTr5B4rhrT+mjglFV/iExuuPaWOe64i1U=; b=CDHmLwqvmFv61NMNM3KD4zGxQmw5Xx1s7GFCT5ctBnow/4FZQclQm/xUZf2LmF39oO CEazh02mVzoIrB9FRrsfe/L6+KkAddWz1vPv5hYPRvd5CUJR4317+cGS39OazUBYXFig VZmEVWI4xBx+wAVistA8UYhkHU9p0Lkdq9Ol43palh2oGc7vyjohwP0WJOYaUPLGFFpv jNt4AKxLdJIHgmzCZCBzQrFYnnxLFvGEkXl+SYem2pRe+x0BSCEcdOizL10g/VWs+GlB T3rlOnAtPEZc3GMZjP76IZ5ohMobIIYTCoKl1M3ekEjDDLXfaH4QgDbYt0dIcW/Wxrdy 8ThA== X-Gm-Message-State: APjAAAVaMGmq36aorwjF2jy9ViFkl15bpZpp0ZdcTDDdFB1M2imoggdu LO8Z9BAb7fuEIAB4Cx+V3nYk0Q== X-Google-Smtp-Source: APXvYqylAfIetuUkjWuHceryYQyBP1Zjb/3IlekX6AHrK7VUGg62YARukPada6ZIp3AaY9PSETtQpA== X-Received: by 2002:a17:902:788b:: with SMTP id q11mr10297102pll.308.1567089612394; Thu, 29 Aug 2019 07:40:12 -0700 (PDT) Received: from hermes.lan (204-195-22-127.wavecable.com. [204.195.22.127]) by smtp.gmail.com with ESMTPSA id z12sm3276819pfg.21.2019.08.29.07.40.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Aug 2019 07:40:12 -0700 (PDT) Date: Thu, 29 Aug 2019 07:40:01 -0700 From: Stephen Hemminger To: Venumadhav Josyula Cc: users@dpdk.org Message-ID: <20190829074001.578153a8@hermes.lan> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-users] Drops seems with virtio PMD driver 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: , Errors-To: users-bounces@dpdk.org Sender: "users" On Thu, 29 Aug 2019 10:12:27 +0530 Venumadhav Josyula wrote: > Hi All, > > We are observing packet drops ~@90Mbs with virtio pmd driver. These packets > are not been > queued in the tx descriptors, the function 'rte_eth_tx_burst' is returning > the less than n. > > So questions are following > i) are there any issues seen ? > > Observations in our case :- > i) packets are dropped and tx packets donot get incremented. > ii) i) happens for 30 secs after that it recovers. > iii) After sometime we see this issue in i) & ii) again. > > Any clues / pointers will help. > > Thanks, > Regards, > Venu The number of transmit descriptors is fixed. If you are producing packets faster than the other consume them then the transmit descriptor ring gets full. So the problem is probably on the other side of your virtio. Are you using KVM? Did you enable virtio net acceleration?