[ns] Queue that can handle variable size packet

[Ying Xu <yingx@ee.upenn.edu>]

Hi, all:
    I'm new to ns. I found that most queue scheduling implementation in
ns, such as droptail, etc, only count on the number of packets, but do
not consider the impact of packet size.
    So if I want to implement a queue with a buffer size of bytes, but
not packets, do I need to rebuild it by my own? (PS--I know TBF is ok
for that, but it's not a queue object and has many limitatins).
    Thanks.

BR/
Ying