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

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Message-ID: <4A89C026.4030402@us.ibm.com>
Date:	Mon, 17 Aug 2009 13:40:06 -0700
From:	Nivedita Singhvi <niv@...ibm.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	netdev@...r.kernel.org, Eric Dumazet <dada1@...mosbay.com>
Subject: Re: UDP multicast packet loss not reported if TX ring overrun?

Christoph Lameter wrote:
> If I use a large send queue
> 
> (echo 2000000 >/proc/sys/net/core/wmem_default)
> 
> then lots of packet loss results if I try to send more packets than
> the bandwidth of the wire (300 bytes the maximum rate is 341k pps). With a
> size of 2M for the output buffer the TX ring is overrun.
> 
> But this loss is nowhere seen in any counter increments:

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

thanks,
Nivedita
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