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

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Message-Id: <1250549034.25939.30.camel@w-sridhar.beaverton.ibm.com>
Date:	Mon, 17 Aug 2009 15:43:54 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Nivedita Singhvi <niv@...ibm.com>, netdev@...r.kernel.org,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

On Mon, 2009-08-17 at 18:13 -0400, Christoph Lameter wrote:
> On Mon, 17 Aug 2009, Sridhar Samudrala wrote:
> 
> > What about ethtool -S ? Does it report any errors?
> 
> Neither. This is is a broadcom bnx2 NIC.

Are you sure the packets are dropped at the sender?
Another place where packet drops/errors are counted is
    /proc/net/softnet_stat
It tracks some counters that could result in drops. I thought these are
all receive statistics. But looks like cpu_collision is a tx stat. The
name of the structure is netif_rx_stat and it includes cpu_collison 
counter.

Thanks
Sridhar

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