interface statistics and outgoing packet queue

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Hi,

does somebody know, which is the default queue where outgoing packets
are getting queued by the kernel?
I don't wanna use any traffic shaping. Just need to monitor that
queue/buffer for each device/interface to count some kind of packetloss,
so i can see very fast when the buffer is full and no packets can leave
the device.
i read about queuing disciplines, but it didnt really helped me. It
seems to me that the default queue is a plain fifo.and i see the enqueue
call (in dev_queue_xmit(struct sk_buff *skb)) of net/core/dev.c. but i
have difficulties to find the way an IP packet goes after that.

I'm using kernel-version 2.4.18

Nikos
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