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

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Message-Id: <1250545839.25939.21.camel@w-sridhar.beaverton.ibm.com>
Date:	Mon, 17 Aug 2009 14:50:39 -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 16:46 -0400, Christoph Lameter wrote:
> 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

What about ethtool -S ? Does it report any errors?

Thanks
Sridhar

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