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

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Message-ID: <alpine.DEB.1.10.0908171642500.20399@gentwo.org>
Date:	Mon, 17 Aug 2009 16:46:29 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Nivedita Singhvi <niv@...ibm.com>
cc:	netdev@...r.kernel.org, Eric Dumazet <dada1@...mosbay.com>
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

On Mon, 17 Aug 2009, Nivedita Singhvi wrote:

> Is there any chance this is getting dropped at qdisc?
> Can you check with tc?

I checked and the counter there is zero.

:/home/clameter# tc -s qdisc show

qdisc pfifo_fast 0: dev eth0 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1
1 1 1 1 1
 Sent 3042712708 bytes 8896862 pkt (dropped 0, overlimits 0 requeues 56303)
 rate 0bit 0pps backlog 0b 0p requeues 56303

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