From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:45593) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Rvmom-0002As-AW for qemu-devel@nongnu.org; Fri, 10 Feb 2012 04:31:04 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Rvmog-0006B3-1Y for qemu-devel@nongnu.org; Fri, 10 Feb 2012 04:31:00 -0500 Received: from indium.canonical.com ([91.189.90.7]:52821) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Rvmof-0006Ar-Sr for qemu-devel@nongnu.org; Fri, 10 Feb 2012 04:30:53 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.71 #1 (Debian)) id 1Rvmoe-00050V-Te for ; Fri, 10 Feb 2012 09:30:52 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id DC8532E815D for ; Fri, 10 Feb 2012 09:30:52 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Fri, 10 Feb 2012 09:25:29 -0000 From: Vincent Autefage <899140@bugs.launchpad.net> Sender: bounces@canonical.com References: <20111202125742.13621.362.malonedeb@soybean.canonical.com> <20120209190551.9454.4849.malone@soybean.canonical.com> Message-Id: <4F34E289.6040309@labri.fr> Errors-To: bounces@canonical.com Subject: Re: [Qemu-devel] [Bug 899140] Re: Problem with Linux Kernel Traffic Control Reply-To: Bug 899140 <899140@bugs.launchpad.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Hi, No I don't try, i will :) The probleme is not present with another NIC so I use another one for = the moment. Vincent Le 09/02/2012 20:05, Henrique Rodrigues a =C3=A9crit : > Vincent, > > Have you tried to change the mtu of the tbf qdisc? The traffic control sh= ould work well if you set it to 65kb. > I believe that this is happening due to the napi gro functionality. I'm s= till not sure, but the problem seems to be related to that. > > Henrique > -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/899140 Title: Problem with Linux Kernel Traffic Control Status in QEMU: New Bug description: Hi, The last main versions of QEMU (0.14.1, 0.15 and 1.0) have an important p= roblem when running on a Linux distribution which running itself a Traffic = Control (TC) instance. Indeed, when TC is configured with a Token Bucket Filter (TBF) with a par= ticular rate, the effective rate is very slower than the desired one. For instance, lets consider the following configuration : # tc qdisc add dev eth0 root tbf rate 20mbit burst 20k latency 50ms The effective rate will be about 100kbit/s ! (verified with iperf) I've encountered this problem on versions 0.14.1, 0.15 and 1.0 but not wi= th the 0.14.0... In the 0.14.0, we have a rate of 19.2 mbit/s which is quiet normal. I've done the experimentation on several hosts : - Debian 32bit core i7, 4GB RAM - Debian 64bit core i7, 8GB RAM - 3 different high performance servers : Ubuntu 64 bits, 48 AMD Opteron, = 128GB of RAM The problem is always the same... The problem is also seen with a Class Based Queuing (CBQ) in TC. Thanks To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/899140/+subscriptions