This is how I am setting the size of a droptail queue:

        $ns queue-limit $n1 $n2 $X

I am seeing behavior where for 1 <= $X <= ~180 everything works fine.

If you push X to say 200, then suddenly there are no more packet drops, 
and there always appears to be 183-186 packets in the queue.

What I am trying to simulate is the rule of thumb buffer sizing which is 
2*BandwidthDelayProduct which for high speed links is on the order of 
thousands of packets.

I've been through queue.cc, queue.h, drop-tail.h and drop-tail.cc and 
can't figure out what's going on.

Any thoughts?

~Ethan

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