LARTC - Apr 2005 - recording packet sent time

Hello

I am writing a qdisc scheduler (called fb in the diagram) that does certain 
packet delaying and other stuff. (for egress traffic)

    root (htb/tbf)
           |
    ---------------
  cl1   cl2        |
                     tbf
                   --------
                   |        |
                 cl3    cl4
                  |        |
                 *fb*     fifo

Now I need to record the time when packets leaves the system. I can''t
do it
in fb since the packet *may* experience buffering delay in higher level 
token bucket.

I was wondering what are my options for such an implementation?
Is it a good option to write a qdisc for this task that will be used as a 
root qdisc? (every packet does travel through it, right?)

Or is there a better location for this code, (or perhaps this is already 
done somewhere?)

(it should be safe to assume that there will be not significat buffering 
delay in the physical device, since the rate will be much lower then the 
device an handle)

With regards
R.Harper

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