[Click] HELP with queue overflow avoidance

[Victor]

Hello,

I am trying to route the UDP unicast flow from wireless link ~1mbps

In some cases I see the queue backing up and at some point that causes the
router to crush.

Is there some known solution to avoid that condition? I tried to increase
queue length. That works for while but how can I select the length to
guarantee overflow avoidance? And how can I avoid system crush even if the
queue is full?

 

Thanks you,

-V