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    SubjectRe: txqueuelen has wrong units; should be time
    On Mon, Feb 28, 2011 at 05:48:14PM +0100, Eric Dumazet wrote:
    > Le lundi 28 février 2011 à 11:11 -0500, John W. Linville a écrit :
    > > 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.

    Well, OK -- I agree it is best if you can return the status at
    enqueue time. The question becomes whether or not a dropped frame
    is worse than living with high latency. The answer, of course, still
    seems to be a bit subjective. But, if the admin has determined that
    a link should be low latency...?

    John W. Linville Someday the world will need a hero, and you might be all we have. Be ready.
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