> Ok, now I see the code where htb creates a default pfifo queue
> for its leaves. And I can't see what limits the pfifo queue size...
> Got to read more code...

And finally I understand. pfifo_fast has a queue length, but it
is taken from the device's queue length, which in the case of
ethernet devices is 100 packets.

I bet there is a way to either change that, or use a different
qdisc so the length can be configured.

I guess I answered my own question.

> And finally I understand. pfifo_fast has a queue length, but it
> is taken from the device's queue length, which in the case of
> ethernet devices is 100 packets.
>
> I bet there is a way to either change that, or use a different
> qdisc so the length can be configured.

:) you got it. The correct way is to attach fifo with your
own limit to a class.
devik