[Bloat] setting queue depth on tail drop configurations of pfifo_fast

[Toke Høiland-Jørgensen]

>I would like to reduce the tail drop queue size to 100 packets (down
>from the default of 1000) and see how that impacts the test. 3 seconds
>of bloat is pretty bad, and I would like to compare how ABR works at at
>1 second and at 200-300 ms.

Did you re-initiate the pfifo_fast qdisc after changing txqlen? IIRC, it picks up the len at init time, and so won't update automatically when you change it...

-Toke