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

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Message-ID: <OFB18AD855.24C5AC71-ON8825761D.00687D5E-8825761D.0068BB9C@us.ibm.com>
Date:	Tue, 25 Aug 2009 12:03:58 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org, niv@...ux.vnet.ibm.com,
	sri@...ux.vnet.ibm.com
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

Christoph Lameter <cl@...ux-foundation.org> wrote on 08/25/2009 06:48:24 
AM:

> On Mon, 24 Aug 2009, Sridhar Samudrala wrote:

> > If we count these drops as qdisc drops, should we also count them as 
IP OUTDISCARDS?
> 
> Yes.

Actually, no. (!)

IP_OUTDISCARDS should count the packets IP dropped, not
anything dropped at a lower layer (which, in general, it
is not aware of). If you count these in multiple layers,
then you don't really know who dropped it.

                                                +-DLS

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