[altq 1471] interface queue limit

[Eduard Hasenleithner <hasenleithner@ftw.at>]

I want to setup a drop-tail queue on the xl0 interface with a limit of 
50 packets. Having failed in finding a parameter for adjusting the queue 
size I intended to use ALTQ for this task. But the "Tips for using ALTQ" 
document mentiones:

     "So, there would be no reason to use FIFOQ unless you want to
     modify the FIFOQ implementation"

Can you give me an hint on how to set the queue limit of an interface or 
am I right that FIFOQ is actually the right queueing mechanism for this 
task?

thankful for any hint,

Eduard Hasenleithner