Re: txqueuelen has wrong units; should be time

From: Eric Dumazet
Date: Mon Feb 28 2011 - 11:48:28 EST

Le lundi 28 fÃvrier 2011 Ã 11:11 -0500, John W. Linville a Ãcrit :
> On Sun, Feb 27, 2011 at 09:07:53PM +0100, Eric Dumazet wrote:
> > Qdisc should return to caller a good indication packet is queued or
> > dropped at enqueue() time... not later (aka : never)
> >
> > Accepting a packet at t0, and dropping it later at t0+limit without
> > giving any indication to caller is a problem.
> Can you elaborate on what problem this causes? Is it any worse than
> if the packet is dropped at some later hop?
> Is there any API that could report the drop to the sender (at
> least a local one) without having to wait for the ack timeout?
> Should there be?

Not all protocols have ACKS ;)

dev_queue_xmit() returns an error code, some callers use it.

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