Seeing the same here, also happens on overbooked hypervisors. Just one or two hosts have this behaviour.
We are using: qemu-kvm 2.0.0+dfsg-2ubuntu1.25 libvirt-bin 1.2.9 kernel 3.13.0-92-generic We are using contrail as a SDN. It looks like it started after upgrading a bunch of packages including kernel (we came from 3.13.0-83-generic) -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1470720 Title: high IRQ-TLB generates network interruptions Status in QEMU: New Bug description: we are having a problem in our hosts, all the vm running on them suddenly, and for some seconds, lost network connectivity. the root cause appears to be the increase of irb-tlb from low values (less than 20) to more than >100k, that spike only last for some seconds then everything goes back to normal i've upload an screenshot of collectd for one hypervisor here http://zumbi.com.ar/tmp/irq-tlb.png we have hosts running precise (qemu 1.5, ovs 2.0.2, libvirt 1.2.2 and kernel 3.13) where the issue is frequent. also we have an small % of our fleet running trusty (qemu 2.0.0 ovs 2.0.2 libvirt 1.2.2 and kernel 3.16) where the problem seemed to be nonexistent until today issue seems to be isolated to < 10% of our hypervisors, some hypervisors had this problem every few days, others only once or twice. our vm are a black box to us we don't know what users run on them, but mostly cpu and network bound workload. most of our guests run centos 6.5 (kernel 2.6.32) vm are bridged to a linuxbridge then veth wired to an ovs switch (neutron openvswitch agent setup) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1470720/+subscriptions
