From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vk0-f43.google.com (mail-vk0-f43.google.com [209.85.213.43]) by dpdk.org (Postfix) with ESMTP id E1CE83005 for ; Mon, 25 Jan 2016 14:37:39 +0100 (CET) Received: by mail-vk0-f43.google.com with SMTP id n1so73539472vkb.3 for ; Mon, 25 Jan 2016 05:37:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=infiniteio-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=SL599chCrAL6JWvZv8ZCD40P1vDaq0/TPiS6m8tqvHI=; b=PRlAoK0Mr3QcQngFuLSRjM6DD6EeG1tMxo77yMtvBp4kF10lRNIi/43gtE2P+k/60/ MiJUNn/r/iRuMX+rUZiRZOPwXbZwhGyyy9D2igHvpaFjaDIpkgVIMJt76mlweTggLkc5 zv18fAw+FXX8IM27jDMyy7OjTz6+MosK8XMT/sY0WEj84v7pJM8L9GFaht7F+/+r9otY xchiPKYICqYjDk0LTDi0j75LHEIlIm14gaO8Y07JeTl8lptolJKYfX3netjQs3/hh8wl wwAVX67ViRcl2M5QIUBESlziL1VPiMcsL7U/nbXs3c7JE3SDwMljJtAHhtsINkG+YvDa 5BtA== 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:date :message-id:subject:from:to:cc:content-type; bh=SL599chCrAL6JWvZv8ZCD40P1vDaq0/TPiS6m8tqvHI=; b=Ng1CyncGN93jhkE2ul9N8BAClBoDgi1aOeqBcvY7EkdTmNNqXVzKomyM5jwTds6EQD jEHc8vt+y973JmX2gEbyTJ8k2QOJ653lhvslYqgFdwcpNjOk6ulC8MVVAu8an5xYZvbw tYWb+yogkK0zvllpTaiB8vilTGCFN8gLb9MAj7r5VnnapN/bNBToVxp0f7nFmhnfmgUq +PHm5zsu0hXlq77G9g2c2LPjPQ11vOnXIYJ49z9OsFVu/0OlfAkuU3sx8FPZarDnqMDq Lbmfza9XLKJvLR+r4ggR1wXuH5dWumN5orCbAs78vWUMS1EUcuv0GQgj9UrpITh7r6Ry KHJA== X-Gm-Message-State: AG10YOTr35LoGdvIVls85r65SPZq7B1uTef2lT5UpTBT6qhz97N4vWvaRukCP7ag58LYcsPvVRqN00wYj3fLPw== MIME-Version: 1.0 X-Received: by 10.31.167.75 with SMTP id q72mr11233753vke.71.1453729059059; Mon, 25 Jan 2016 05:37:39 -0800 (PST) Received: by 10.103.96.3 with HTTP; Mon, 25 Jan 2016 05:37:38 -0800 (PST) In-Reply-To: References: Date: Mon, 25 Jan 2016 07:37:38 -0600 Message-ID: From: Jay Rolette To: Masoud Moshref Javadi Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Cc: users@dpdk.org Subject: Re: [dpdk-users] high jitter in dpdk kni 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: Mon, 25 Jan 2016 13:37:40 -0000 I dug into essentially the same issue last year. This post explains what I found and what I did to improve the situation: http://dpdk.org/ml/archives/dev/2015-June/018850.html Jay On Sat, Jan 23, 2016 at 8:17 AM, Masoud Moshref Javadi < masood.moshref.j@gmail.com> wrote: > I see jitter in KNI RTT. I have two servers. I run kni sample application > on one, configure its IP and ping an external interface. > > sudo -E build/kni -c 0xaaaa -n 4 -- -p 0x1 -P --config="(0,3,5)" > sudo ifconfig vEth0 192.168.1.2/24 > ping 192.168.1.3 > > This is the ping result: > 64 bytes from 192.168.1.2: icmp_seq=5 ttl=64 time=1.93 ms > 64 bytes from 192.168.1.2: icmp_seq=6 ttl=64 time=0.907 ms > 64 bytes from 192.168.1.2: icmp_seq=7 ttl=64 time=3.15 ms > 64 bytes from 192.168.1.2: icmp_seq=8 ttl=64 time=1.96 ms > 64 bytes from 192.168.1.2: icmp_seq=9 ttl=64 time=3.95 ms > 64 bytes from 192.168.1.2: icmp_seq=10 ttl=64 time=2.90 ms > 64 bytes from 192.168.1.2: icmp_seq=11 ttl=64 time=0.933 ms > > The ping delay between two servers without kni is 0.170ms. > I'm using dpdk 2.2. > > Any thought on how to keep KNI delay predictable? > > Thanks >