+ - 1 - 256, number of internal threads in addition to the caller thread (8 is suggested).
+ This value, if not 0, should be the same for all the devices;
+ the first probing will take it with the ``event_core``
+ for all the multi-thread configurations in the driver.
+
+- ``hw_latency_mode`` parameter [int]
+
+ The completion queue moderation mode:
+
+ - 0, HW default.
+
+ - 1, Latency is counted from the first packet completion report.
+
+ - 2, Latency is counted from the last packet completion.
+
+- ``hw_max_latency_us`` parameter [int]
+
+ - 1 - 4095, The maximum time in microseconds that packet completion report
+ can be delayed.
+
+ - 0, HW default.
+
+- ``hw_max_pending_comp`` parameter [int]
+
+ - 1 - 65535, The maximum number of pending packets completions in an HW queue.
+
+ - 0, HW default.
+
+- ``queue_size`` parameter [int]
+
+ - 1 - 1024, Virtio queue depth for pre-creating queue resource to speed up
+ first time queue creation. Set it together with ``queues`` parameter.
+
+ - 0, default value, no pre-create virtq resource.
+
+- ``queues`` parameter [int]
+
+ - 1 - 128, Maximum number of virtio queue pair (including 1 Rx queue and 1 Tx queue)
+ for pre-creating queue resource to speed up first time queue creation.
+ Set it together with ``queue_size`` parameter.
+
+ - 0, default value, no pre-create virtq resource.