netdev - Re: txqueuelen has wrong units; should be time

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Date:	Mon, 28 Feb 2011 17:48:14 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Jussi Kivilinna <jussi.kivilinna@...et.fi>,
	Albert Cahalan <acahalan@...il.com>,
	Mikael Abrahamsson <swmike@....pp.se>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: txqueuelen has wrong units; should be time

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.



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