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Message-ID: <1412119398.16704.11.camel@edumazet-glaptop2.roam.corp.google.com>
Date: Tue, 30 Sep 2014 16:23:18 -0700
From: Eric Dumazet <eric.dumazet@...il.com>
To: Rick Jones <rick.jones2@...com>
Cc: netdev@...r.kernel.org
Subject: Re: Philosophical question: Is a UDP multicast datagram for which
there is no socket match a drop or an ignore?
On Tue, 2014-09-30 at 16:09 -0700, Rick Jones wrote:
> I've been looking at some additional perf <mutter> -e skb_kfree_skb
> results, this time with a laptop connected to a corporate network with a
> large number of Windows systems sending out what they are wont to
> send... The laptop is just sitting there no active netperfs or anything :)
>
> I see profile hits for __udp4_lib_mcast_deliver() which has a
> kfree_skb() call which will happen if either there were no sockets
> found, or if an integral multiple of ARRAY_SIZE(stack) sockets are
> found. I'm assuming the latter is exceedingly rare.
>
> Anywho, the philosophical question - is such a situation a drop
> (indicating the existing kfree_skb()), or is it an ignore (indicating a
> consume_skb())? Should there be a statistic incremented for either of
> those?
I guess we lack a UDP_MIB_NOPORTS increase here.
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