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

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Message-ID: <alpine.DEB.1.10.0908250946520.5972@gentwo.org>
Date:	Tue, 25 Aug 2009 09:48:24 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Sridhar Samudrala <sri@...ibm.com>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Nivedita Singhvi <niv@...ibm.com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

On Mon, 24 Aug 2009, Sridhar Samudrala wrote:

> So are you hitting this case with your workload and does this account for all the
> packet losses you are seeing?

Yes.

> If we are dropping the packet and returing NET_XMIT_DROP, should
> we also increment qdisc drop stats (sch->qstats.drops)?

I think so but I am no expert. I was surprised to not even see counter
increments at that level. But I was content to fix up the higher level
tracking to have at least one counter that showed the packet loss.

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

Yes.

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