netdev - RE: rx_dropped count for USB ethernet interfaces

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Date:	Fri, 27 Sep 2013 09:39:00 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"David Miller" <davem@...hat.com>
Cc:	<netdev@...r.kernel.org>
Subject: RE: rx_dropped count for USB ethernet interfaces

> From: "David Laight" <David.Laight@...LAB.COM>
> Date: Thu, 26 Sep 2013 10:32:24 +0100
> 
> > It isn't exactly useful behaviour though.
> 
> In your opinion.
> 
> We have tracepoints for people who want more fine grained drops
> in these kinds of situations.
> 
> Also, the behavior of this statistic has existed for more than a
> decade so changing it is really not in the cards.  Therefore any
> discussion about what would have been the best samentic to choose from
> the beginning is moot.

I suspect that not many people have networks with broadcast packets
for non-IP protocols - so don't ever see rx_dropped being incremented
because there wasn't a protocol stack looking for the packet.

A similar problem will arise if promiscuous mode is enabled
by someone who only wants a specific protocol - eg a specific
ethertype or a single LLC SAP value.

	David



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