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+high IRQ-TLB generates network interruptions
+
+ 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)
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