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Delay measurements

I have to perform some measuraments on the delay experienced by EF
packets through a DS router (Linux 2.2.10+DS6). Is there a simple (or
already implemented) way to measure internal queueing delays with some
'tc' function?
If not, I  was thinking to work on it by extending one of the messages
the 'tc' command sends to the kernel, and having the kernel send the
values back to the application. Before I start coding, does anyone have
any comments or suggestions?

    Giacomo Sergio