** Changed in: qemu (Ubuntu) Importance: Undecided => Medium ** Changed in: qemu (Ubuntu Vivid) Importance: Undecided => Medium
** Changed in: qemu (Ubuntu Wily) Importance: Undecided => Medium -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1546445 Title: support vhost user without specifying vhostforce Status in Ubuntu Cloud Archive: New Status in QEMU: In Progress Status in qemu package in Ubuntu: New Status in qemu source package in Vivid: Won't Fix Status in qemu source package in Wily: Fix Released Bug description: [Impact] * vhost-user falls back to virtio-net which causes performance lose without specifying the vhostforce option. But it should be the default behavior for vhost-user, since guests using PMD doesn't support msi-x. [Test Case] create a vhost-user virtio backend without specifying the vhostforce option, i.e. -netdev type=vhost-user,id=mynet1,chardev=<char_dev_for_the_controll_channel> start the VM vhost-user is not enabled [Regression Potential] * none vhost user nic doesn't support non msi guests(like pxe stage) by default. Vhost user nic can't fall back to qemu like normal vhost net nic does. So we should enable it for non msi guests. The problem has been fix in qemu upstream - http://git.qemu.org/?p=qemu.git;a=commitdiff;h=24f938a682d934b133863eb421aac33592f7a09e. And the patch needs to be backported to 1:2.2+dfsg-5expubuntu9.8 . To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-archive/+bug/1546445/+subscriptions
