Simple queues set to ALL interface or specific Interface?

I’m wondering if Simple Queues should be set to ALL Interfaces or should they be set to a specific Interface? I’ve tested with them set to all and set to ether2 “going to my wireless network” and it worked both ways. It seems they should be set to a specific Interface to reduce the amount of processing, but maybe not? Any input on this?

from http://wiki.mikrotik.com/wiki/Queue

Flow Identifiers

  • target-addresses (multiple choice: IP address/netmask) : list of IP address ranges that will be limited by this queue.
  • interface (Name of the interface, or all) : identifies interface the target is connected to. Useful when it is not possible to specify targets addresses.

Each of these two properties can be used to determine which direction is target upload and which is download.

Be careful to configure both of these options for the same queue - in case they will point to opposite directions queue will not work.

If neither value of target-addresses nor of interface is specified, the queue will not be able to make difference between upload and download, and will limit all traffic twice.