From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53318) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQ9iB-0000g7-6O for qemu-devel@nongnu.org; Tue, 24 Feb 2015 02:15:19 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YQ9i6-0007aB-IL for qemu-devel@nongnu.org; Tue, 24 Feb 2015 02:15:18 -0500 Received: from mx0.marathonbet.ru ([194.9.2.180]:40606) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YQ9i6-0007Zj-BM for qemu-devel@nongnu.org; Tue, 24 Feb 2015 02:15:14 -0500 Received: from [10.0.3.109] (kazakov.mara.local [10.0.3.109]) by mx0.marathonbet.ru (Postfix) with ESMTP id F05C960271 for ; Tue, 24 Feb 2015 10:15:11 +0300 (MSK) Message-ID: <54EC24FF.3000407@marathonbet.ru> Date: Tue, 24 Feb 2015 10:15:11 +0300 From: Michael Kazakov MIME-Version: 1.0 References: <54E706ED.4040804@marathonbet.ru> In-Reply-To: <54E706ED.4040804@marathonbet.ru> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] Packet dropps in virtual tap interface List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Hello. We use our highly load system in OpenStack environment. And faced=20 with serious problems in network highload guests. At a relatively high=20 CPU load of hypervisor (40-60%) virtual network interfaces of this=20 guests starts to droppart of the packets. We use for virtualization=20 qemu-kvm with vhost driver: "... -netdev=20 tap,fd=3D30,id=3Dhostnet0,vhost=3Don,vhostfd=3D31 -device=20 virtio-net-pci,netdev=3Dhostnet0,id=3Dnet0,mac=3Dfa:16:3e:86:67:7b,bus=3D= pci.0,addr=3D0x3...".=20 The problem can be seen with the ifconfig utility: tape4009073-0b Link encap:Ethernet HWaddr fe:16:3e:86:67:7b inet6 addr: fe80::fc16:3eff:fe86:677b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1587622634 errors:0 dropped:0 overruns:0 frame:0 TX packets:1484106438 errors:0 dropped:460259 overruns:0=20 carrier:0 collisions:0 txqueuelen:500 RX bytes:877878711500 (877.8 GB) TX bytes:3071846828531 (3.0=20 TB) Could you do a little look at our problem and give advice which=20 direction to continue our investigation? --=20 =D0=A1 =D1=83=D0=B2=D0=B0=D0=B6=D0=B5=D0=BD=D0=B8=D0=B5=D0=BC, =D0=9C=D0=B8=D1=85=D0=B0=D0=B8=D0=BB =D0=9A=D0=B0=D0=B7=D0=B0=D0=BA=D0=BE= =D0=B2 =D0=A1=D1=82=D0=B0=D1=80=D1=88=D0=B8=D0=B9 =D1=81=D0=B8=D1=81=D1=82=D0=B5= =D0=BC=D0=BD=D1=8B=D0=B9 =D0=B0=D0=B4=D0=BC=D0=B8=D0=BD=D0=B8=D1=81=D1=82= =D1=80=D0=B0=D1=82=D0=BE=D1=80 OOO "=D0=A1=D0=9F=D0=9B=D0=90=D0=A2"