netdev - Re: UDP multicast packet loss not reported if TX ring overrun?

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Message-ID: <alpine.DEB.1.10.0908281553190.17784@gentwo.org>
Date:	Fri, 28 Aug 2009 15:53:42 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
cc:	sri@...ibm.com, dlstevens@...ibm.com, eric.dumazet@...il.com,
	netdev@...r.kernel.org, niv@...ux.vnet.ibm.com
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

On Fri, 28 Aug 2009, David Miller wrote:

> From: Christoph Lameter <cl@...ux-foundation.org>
> Date: Fri, 28 Aug 2009 09:53:40 -0400 (EDT)
>
> > Seems though that the qdisc drop count does not flow into the tx_dropped
> > counter for the interface.
>
> And it should not.
>
> The qdisc drops the packet due to flow control, not the hardware
> device.
>
> Device drops are for things like transmission errors on the wire.
>
> If you start incrementing tx_dropped here, people won't be able
> to tell they have a deteriorating cable or bad switch or similar.

?? The patch does not do that. That was extra stuff not covered by the
patch.

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