From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44131) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cb5N5-0003QI-7E for qemu-devel@nongnu.org; Tue, 07 Feb 2017 07:59:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cb5N2-0002Kz-47 for qemu-devel@nongnu.org; Tue, 07 Feb 2017 07:59:47 -0500 Received: from indium.canonical.com ([91.189.90.7]:52668) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cb5N1-0002Jz-VG for qemu-devel@nongnu.org; Tue, 07 Feb 2017 07:59:44 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.76 #1 (Debian)) id 1cb5N1-0005Mu-2w for ; Tue, 07 Feb 2017 12:59:43 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 12EAB2E80C4 for ; Tue, 7 Feb 2017 12:59:43 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 07 Feb 2017 12:47:34 -0000 From: Thomas Huth <899140@bugs.launchpad.net> Reply-To: Bug 899140 <899140@bugs.launchpad.net> Sender: bounces@canonical.com References: <20111202125742.13621.362.malonedeb@soybean.canonical.com> Message-Id: <20170207124734.6409.41982.malone@wampee.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 899140] Re: Problem with Linux Kernel Traffic Control List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Can you still reproduce this issue with the latest version of QEMU (currently v2.8), or could we close this ticket nowadays? ** Changed in: qemu Status: New =3D> Incomplete -- = 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: Incomplete 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