From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37012) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aepmd-0004dx-BH for qemu-devel@nongnu.org; Sat, 12 Mar 2016 15:05:08 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aepma-0003tY-4p for qemu-devel@nongnu.org; Sat, 12 Mar 2016 15:05:07 -0500 Received: from mx1.redhat.com ([209.132.183.28]:34069) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aepmZ-0003sW-Vt for qemu-devel@nongnu.org; Sat, 12 Mar 2016 15:05:04 -0500 Date: Sat, 12 Mar 2016 22:05:00 +0200 From: "Michael S. Tsirkin" Message-ID: <20160312220404-mutt-send-email-mst@redhat.com> References: <20160311224429.1091.77269.malonedeb@gac.canonical.com> <20160311225133.17678.21933.malone@wampee.canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160311225133.17678.21933.malone@wampee.canonical.com> Subject: Re: [Qemu-devel] [Bug 1556306] Re: vhost-user: qemu stops processing packets under high load of traffic List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Bug 1556306 <1556306@bugs.launchpad.net> Cc: qemu-devel@nongnu.org On Fri, Mar 11, 2016 at 10:51:33PM -0000, Vincent JARDIN wrote: > for tracking, > http://git.qemu.org/?p=qemu.git;a=patch;h=5669655aafdb88a8797c74a989dd0c0ebb1349fa > > -- > You received this bug notification because you are a member of qemu- > devel-ml, which is subscribed to QEMU. > https://bugs.launchpad.net/bugs/1556306 > > Title: > vhost-user: qemu stops processing packets under high load of traffic > > Status in QEMU: > New I presume you'll also close this bu at some point? It's fixed in upstream QEMU. > Bug description: > Description of problem: > - qemu socket becomes full, causing qemu to send incomplete > SET_VRING_CALL messages to vhost-user backend (without proper fd set in > ancillary data). > - after some time, some interrupts are lost, causing the VM to stop > transmitting packets. > > How reproducible: > Run a stress tests of a vhost-user interface using an UDP > traffic generator. Traffic generator (IXIA) was connected to 2 physical ports that are in turn connected to 2 virtio ports through a linux bridge, VM > (running linux) doing routing to forward packets between the 2 virtio ports. > When traffic reaches high pps rates of small packets, > > Actual results: > - VM stop transmitting packets > > Expected results: > - VM should never stop transmitting packets > > Additional info: > We do propose a fix at: > http://lists.nongnu.org/archive/html/qemu-devel/2015-12/msg00652.html > > To manage notifications about this bug go to: > https://bugs.launchpad.net/qemu/+bug/1556306/+subscriptions