This is a known issue being tracked in the following GitHub OVN issue, #174. The issue states the following:

when iface type is dpdk type, the runtime_data_ovs_interface_handler will always trigger recompute. {_}
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{}Because is_iface_vif function not consider the dpdk type, so untime_data_ovs_interface_handler will always trigger recompute. When the logical flows is too much, will impact on network delay.{_}