+- ``mbx_time_limit_ms`` (default ``500``)
+ Used to define the mailbox time limit by user.
+ Current, the max waiting time for MBX response is 500ms, but in
+ some scenarios, it is not enough. Since it depends on the response
+ of the kernel mode driver, and its response time is related to the
+ scheduling of the system. In this special scenario, most of the
+ cores are isolated, and only a few cores are used for system
+ scheduling. When a large number of services are started, the
+ scheduling of the system will be very busy, and the reply of the
+ mbx message will time out, which will cause our PMD initialization
+ to fail. So provide access to set mailbox time limit for user.
+
+ For example::
+ -a 0000:7d:00.0,mbx_time_limit_ms=600