More than one worker thread. I dig in deep and I know that when enable handoff feature, "worker thread read from dpdk-input after that, it will also redirect packet to frame queue for appropriate worker thread queue based on hash key function". That is why i'm said worker thread is io threads also.
Of course, I know that RSS feature, but it depends on the NIC feature. --> Supporting RSS software (using IO thread) on NIC without RSS feature and I can enable if needed.
