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

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Message-ID: <alpine.DEB.1.10.0908251514190.17963@gentwo.org>
Date:	Tue, 25 Aug 2009 15:15:09 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Stevens <dlstevens@...ibm.com>
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?

On Tue, 25 Aug 2009, David Stevens wrote:

> 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.

You are right. I skipped that IP OUTDICARDS reference. They need to be
accounted at the qdisc level though.

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