** Description changed: + [SRU Justification] + Impact: qemu stops processing traffic + Test case: see below (stress test using udp traffic generator) + Fix: cherrypick of upstream patch to fix this problem. + 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 + http://lists.nongnu.org/archive/html/qemu-devel/2015-12/msg00652.html
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1556306 Title: vhost-user: qemu stops processing packets under high load of traffic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1556306/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
