netdev - Re: [PATCH] core: add stat to track unresolved discards in neighbor cache

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Message-Id: <20080716.205059.206038375.davem@davemloft.net>
Date:	Wed, 16 Jul 2008 20:50:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nhorman@...driver.com
Cc:	netdev@...r.kernel.org, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] core: add stat to track unresolved discards in
 neighbor cache

From: Neil Horman <nhorman@...driver.com>
Date: Tue, 15 Jul 2008 13:37:31 -0400

> in __neigh_event_send, if we have a neighbour entry which is in NUD_INCOMPLETE
> state, we enqueue any outbound frames to that neighbour to the neighbours
> arp_queue, which is default capped to a length of 3 skbs.  If that queue exceeds
> its set length, it will drop an skb on the queue to enqueue the newly arrived
> skb.  This results in a drop for which we have no statistics incremented.  This
> patch adds an unresolved_discards stat to /proc/net/stat/ndisc_cache to track
> these lost frames.
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>

Applied, thanks a lot Neil.
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